KCL-294 - upgrade to MAPI v2

[Simply007]

Motivation

Fixes #50 and #53

• Merge URL Builder
• Validate Elements values in language variants in tests
• Try to remove custom custom serializer - covertToDynamicObject, DynamicObjectJsonConverter (Unable to send a value of 0 for decimal element #29 - works in Management v2 - validate with strongly typed models)
• Add collection identifier
• Remove SiteMap from SDK (incl tests) - it is deprecated
• Transform dynamic element to Strongly type models (value based on Generic element, reference object is a POCO class)
• Cover all endpoints from Management API v2 #50
  • I think these three are still missing (see https://github.com/Simply007/kontent-migrations-boilerplate-net/blob/master/Migrations/05_SampleMigrateAuthors.cs#L25-L31)
    • GET /{project_id}/types/{type_identifier}/variants
    • GET /{project_id}/types/{type_identifier}/components
    • GET /{project_id}/types/{type_identifier}/collections
  • It might be nice to mark methods with the URLs somehow for better coverage verification
• Adjust Model Generator
• Modify ModelProvider to be able to work with rich text, multiple-choice, and URL slug elements
• Walk through the differences among MAPI v1 and MAPI v2 (at least from here https://docs.kontent.ai/changelog/product-changelog?show=mapi&breaking=true#a-changes-to-management-api-v2)
• Revalidate namespaces for Kentico.Kontent.Management.Models.* - specifically Kentico.Kontent.Management.Models.Items -> Kentico.Kontent.Management.Models.Identifires and revalidate everything else.
• Backup project a9931a80-9af4-010b-0590-ecb1273cf1b8 and replace the local backup in the repository (2 new elements added to article -> Rating(NumberElement) + SelectedForm(CustomElement))
• Finish complex elements support: assets, multiple-choice taxonomy, linked items a rich-text
• Think about unifying all Identifiers to Reference
• Do we want to have strongly typed elements in RichText elements property? -> Strongly types for RichText element components' elements #77
• Cover searched value for custom element
• Rename ContentItemVariants to LanguageVariant as in https://github.com/Kentico/kontent-management-sdk-js/blob/master/lib/models/language-variants/language-variant.models.ts#L19
• Match method names with JS SDK: https://github.com/Kentico/kontent-management-sdk-js/blob/master/lib/client/imanagement-client.interface.ts
• Fix test extended in a480e28 (Options is Enumerable for Multichoice element)

Checklist

• Code follows coding conventions held in this repo
• Automated tests have been added
• Tests are passing
• Docs have been updated (if applicable)
• Temporary settings (e.g. variables used during development and testing) have been reverted to defaults

How to test

If manual testing is required, what are the steps?

[gormal]

We won't transform dynamic elements to strongly typed models as of now. We keep them dynamic and use some kind of workaround in order to be able to access them by codename.

[codecov]

Codecov Report

Merging #67 (d004693) into master (e0dafcb) will increase coverage by 5.36%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #67      +/-   ##
==========================================
+ Coverage   69.13%   74.50%   +5.36%     
==========================================
  Files          57      142      +85     
  Lines        1241     2067     +826     
  Branches      159      220      +61     
==========================================
+ Hits          858     1540     +682     
- Misses        304      394      +90     
- Partials       79      133      +54     

Impacted Files	Coverage Δ
...co.Kontent.Management/Models/Assets/AssetFolder.cs	0.00% <0.00%> (-100.00%)	⬇️
...t/Models/Assets/AssetListingResponseServerModel.cs	25.00% <0.00%> (-37.50%)	⬇️
...ico.Kontent.Management/Models/Assets/AssetModel.cs	92.30% <0.00%> (-7.70%)	⬇️
...odules/ActionInvoker/DynamicObjectJsonConverter.cs	78.37% <0.00%> (-5.50%)	⬇️
...Kontent.Management/Models/ProjectReport/Project.cs	100.00% <0.00%> (ø)
...ontent.Management/Models/Items/ContentItemModel.cs	100.00% <0.00%> (ø)
...ntent.Management/Models/Assets/AssetDescription.cs	100.00% <0.00%> (ø)
...ntent.Management/Models/Assets/AssetUpsertModel.cs	100.00% <0.00%> (ø)
....Management/Models/Items/ContentItemCreateModel.cs	100.00% <0.00%> (ø)
....Management/Models/Items/ContentItemUpsertModel.cs	100.00% <0.00%> (ø)
... and 129 more

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[Simply007]

I have just market some places, that needs to be verified.

[Simply007]

Closing the pull request draft.

We will work on vNext branch until the version is stable and ready for the final release.

All issues to be covered in this version is in vNext milestone