Add JSON streaming parser and configuration database libraries

[mikee47]

This PR adds an initial release of the ConfigDB library which arose from discussion #2871. The library does not use ArduinoJson but instead a streaming parser which is a useful addition and well suited to parsing and filtering large data sets.

[what-the-diff]

PR Summary

• Introducing New Submodule: Libraries.ConfigDB
  We added a new component Libraries.ConfigDB with the specific location at Sming/Libraries/ConfigDB. You can find its complete details on its GitHub page.

• Introducing New Submodule: Libraries.JsonStreamingParser
  We incorporated another new component Libraries.JsonStreamingParser located at Sming/Libraries/JsonStreamingParser. Comprehensive details about this component are available on its GitHub page.

• Git Submodules File Update
  We've updated the .gitmodules file to identify and manage the new submodules. For both of these submodules, we've added an ignore = dirty option, to help prevent uncommitted changes in the submodule from leaking into the superproject.

• New Directories for Submodules
  We've created specific directories for both ConfigDB and JsonStreamingParser to house their respective subproject details and commits.