Add e2e tests skeleton for generated cpp code

[osdnk]

NOTE: This PR was done in order to validate buck build on CI. Do not merge!
Summary:
This diff add e2e code generator validation. I added proper buck roles and added tests.

Also, fixed few minor problems:
getBool and getNumber shouldn't have rt param.

Generators now start considering whole module name instead of sliced part of their name.

Fixed import structure.

Fixed filename in generate cpp code (previously was NativeModules.h, now it's cpp file)

renamed jsireact to ReactCommon following D16231697

Differential Revision: D16221277

[pull-bot]

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Generated by 🚫 dangerJS against 7742097

[react-native-bot]

This pull request was successfully merged by @osdnk in d672247.

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