DevX: Add Codecov

[ismailgulek]

Part of element-hq/element-ios#6306

Used the same config file with https://github.com/vector-im/element-x-ios/blob/develop/codecov.yml, as i've no shining ideas to append atm.

If i'm correct Codecov will be able to comment on subsequent PRs after the base coverage is detected when this is merged. We should be able to see the difference also at https://app.codecov.io/gh/matrix-org/matrix-ios-sdk/pulls

[stefanceriu]

Nice but I'm not sure this is going to generate the intended results. ElementX does 2 extra things:
1) Enables coverage data gathering on the main scheme https://github.com/vector-im/element-x-ios/blob/develop/ElementX/SupportingFiles/target.yml#L23
and
2) Exports the resulting coverage data in a format that Codecov understands (cobertura) https://github.com/vector-im/element-x-ios/blob/develop/fastlane/Fastfile#L93

[stefanceriu]

👍

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (develop@6f9cac7). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop    #1502   +/-   ##
==========================================
  Coverage           ?   11.66%           
==========================================
  Files              ?      507           
  Lines              ?    83158           
  Branches           ?    35522           
==========================================
  Hits               ?     9704           
  Misses             ?    73096           
  Partials           ?      358           

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