feat(pyclient): add support for GraphQL API to 'get' method

[YpeZ]

What are the main changes you did

This PR adds functionality to the Pyclients get method to be able to retrieve data through the GraphQL API.
The following things need to be implemented before the PR is ready for review:

• create parsing function to convert a table's metadata to a GraphQL query
• implement the distinction between CSV and GraphQL API call in get
• add columns parameter to get, specifying which columns need to be returned
• add expand parameter to expand the query on reference columns to gather all columns from the referenced table
• implement query filter on GraphQL query

How to test

• explain here what to do to test this (or point to unit tests)

Checklist

• updated docs in case of new feature
• added/updated tests
• added/updated testplan to include a test for this fix, including ref to bug using # notation

[YpeZ]

In my latest commit I implemented a filter on the columns of the output of get, i.e. get me the values of only these column of the table.
This leads to discrepancies between the results of the GraphQL and CSV API, as the columns of a table from the GraphQL API and the CSV API may differ. In my GraphQL query building I include REFBACKs whereas the CSV API does not.

This and my expectation that the implementation of the query_filter for GraphQL will differ significantly from the CSV one makes me consider separating these methods into a method for each API, as for the user the arguments they fill in for either format will differ significantly.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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