Feat/issue #262 - allow to pass custom headers to oauth requests

[nihaux]

Solve #262
It is now possible to pass a customHeaders parameter to the authorize and refresh functions.
Thoses headers are injected in the connection used for the requests by the CustomConnectionBuilder

To test, in a react-native project:

• clone [email protected]:nihaux/react-native-app-auth.git somewhere in the android folder && checkout feat/issue-262
• setup react-native-app-auth but in settings.gradle replace the path in project(':react-native-app-auth').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-app-auth/android') with the path to the cloned repo.
• in the react-native app, make a call to authorize with customHeaders set
• in the debugger check for custom headers

• include issue number that will be resolved by this PR (e.g. Fixes #1234)
• include a summary of the work
• update tests (if applicable)
• update readme (if applicable)
• update typescript definitions (if applicable)
• include steps to verify

TODO

• squash

[kadikraman]

Thanks for your PR! I'm having some trouble testing it, since my Android emulator keeps crashing on the reddit login page. Not sure if it's the emulator's fault or Reddits or mine. I'll try to install a different emulator, or if that doesn't work, find a friend with an Android phone to try it out. Sorry for the delay :)

[nihaux]

No worries not in a hurry :)

[kadikraman]

It works! 👍