[ENH] Implemented new endpoint to return known node APIs

[rmanaem]

• Closes New endpoint to return known node APIs #26

Changes proposed in this pull request:

• Modified the format of the NB_NODES as a string of strings to string of tuples
• Renamed NB_NODES to LOCAL_NB_NODES
• Refactored and renamed parse_nodes_as_list to parse_nodes_as_dict
• Updated tests
• Updated get function in crud.py
• Fixed the parsing/creation of the output in get_terms function of crud.py
• Implemented CohortQueryResponse
• Added response_model for get_query endpoint
• Implemented nodes router and an endpoint to return all known node APIs

Checklist

• PR has an interpretable title with a prefix ([ENH], [FIX], [REF], [TST], [CI], [MNT], [INF], [MODEL], [DOC]) (see https://neurobagel.org/contributing/pull_requests for more info)
• PR links to GitHub issue with mention Closes #XXXX
• Tests pass
• Checks pass

For new features:

• Tests have been added

For bug fixes:

• There is at least one test that would fail under the original bug conditions.

[coveralls]

Pull Request Test Coverage Report for Build 6906358008

• 47 of 47 (100.0%) changed or added relevant lines in 6 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+1.8%) to 92.969%

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Totals
Change from base Build 6893463369:	1.8%
Covered Lines:	119
Relevant Lines:	128

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💛 - Coveralls

[surchs]

Thanks @rmanaem! Nice regex use! I left a couple of suggestions with clarity in mind, take a look.

I do think that we should emit warnings if the LOCAL_NB_NODES contains bad input. If that's a bigger deal to address, please make a separate issue to raise that warning so we don't forget

[rmanaem]

@surchs Made an issue for the warning. See #31

[surchs]

🚀 PR was released in v0.1.0 🚀