don't require Foundation to build FlyingSocks

[lhoward]

For embedded Linux systems, it's ideal to build FlyingSocks without the Foundation dependency (i.e. just with FoundationEssentials, as it doesn't pull in ICU). This requires conditional imports and moving some files around.

[lhoward]

Leaving as a draft as tests aren't passing.

✘ Test directoryHandler_ReturnsSubDirectoryFile() recorded an issue at DirectoryHTTPHandlerTests.swift:68:9: Expectation failed: (response.statusCode → HTTPStatusCode(code: 404, phrase: "Not Found")) == (.ok → HTTPStatusCode(code: 200, phrase: "OK"))
✘ Test directoryHandler_ReturnsSubDirectoryFile() recorded an issue at DirectoryHTTPHandlerTests.swift:69:9: Expectation failed: (response.headers[.contentType] → nil) == "application/json"
✘ Test directoryHandler_ReturnsSubDirectoryFile() recorded an issue at DirectoryHTTPHandlerTests.swift:70:9: Expectation failed: try await response.bodyString == #"{"type": "malt"}"#
✘ Test directoryHandler_ReturnsFile() recorded an issue at DirectoryHTTPHandlerTests.swift:43:9: Expectation failed: (response.statusCode → HTTPStatusCode(code: 404, phrase: "Not Found")) == (.ok → HTTPStatusCode(code: 200, phrase: "OK"))
✘ Test directoryHandler_ReturnsFile() recorded an issue at DirectoryHTTPHandlerTests.swift:44:9: Expectation failed: (response.headers[.contentType] → nil) == "application/json"
✘ Test directoryHandler_ReturnsFile() recorded an issue at DirectoryHTTPHandlerTests.swift:45:9: Expectation failed: try await response.bodyString == #"{"fish": "cakes"}"#
✘ Suite DirectoryHTTPHandlerTests failed after 0.013 seconds with 6 issues.
✘ Test run with 380 tests in 45 suites failed after 1.131 seconds with 6 issues.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 92.80%. Comparing base (5aac1b7) to head (7d597c9).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
FlyingSocks/Sources/SocketPool.swift	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #188   +/-   ##
=======================================
  Coverage   92.80%   92.80%           
=======================================
  Files          68       68           
  Lines        3448     3448           
=======================================
  Hits         3200     3200           
  Misses        248      248           

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[swhitty]

great this has been on my list for while, thank you Luke 👌