Deprecate `uniforms-bridge-simple-schema` package

[piotrpospiech]

Deprecate the Meteor SimpleSchema bridge, as mentioned in this issue (https://github.com/vazco/uniforms/issues/1315).

• Removed the whole package from the uniforms repository
• Removed package from the labeler
• Removed SimpleSchema from the Readme file
• Removed the uniforms-bridge-simple-schema package from the package.json files
• Removed bridge from tsconfig references
• Removed mocks and removed __mocks__ directory config

[!NOTE] I left the SimpleSchemaBridge docs. We will keep that in the uniforms v3 docs.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.24%. Comparing base (1436d4c) to head (ee87287).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1323 +/- ## ========================================== - Coverage 94.37% 94.24% -0.14% ========================================== Files 229 226 -3 Lines 3754 3664 -90 Branches 1011 989 -22 ========================================== - Hits 3543 3453 -90 Misses 81 81 Partials 130 130 ```

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