feat(api): Added functions for fetching the connector version feeds.

[JR-Morgan]

Added functions for querying the connector version feeds to allow the Blender connector to detect whether there is a connector update avaiable.

Very similar logic exists already in

• C# https://github.com/specklesystems/connector-installers/blob/main/csharp/build/LatestConnectorVersion.cs
• and in TS - https://github.com/specklesystems/speckle-releases/blob/main/netlify/functions/latest-connector-version.mts

I've added tests for these functions in the integration test project. However, I am querying the live server releases.speckle.dev... not ideal way to integration test but I couldn't think of another way to do it easily. @gjedlicska how allergic are you to this? bearing in mind the C# and TS equivalents to these functions don't have ANY tests 😅

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.07%. Comparing base (f5e024c) to head (f40be56).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #435      +/-   ##
==========================================
+ Coverage   90.01%   90.07%   +0.06%     
==========================================
  Files         130      132       +2     
  Lines        6100     6139      +39     
==========================================
+ Hits         5491     5530      +39     
  Misses        609      609              

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