Added ApiOption overloads to methods on I(Observable)RepositoryPagesClient

[shiftkey]

Fixes #1178

Supersedes #1213 and addresses merge conflict

[shiftkey]

@ryangribble can I get a 👍 here before I merge this in?

[ryangribble]

Looks pretty good, although I didn't see integration tests that actually test the pagination... Is that because there isn't a suitable repo that has enough responses?

[shiftkey]

@ryangribble it's because anything related to Pages requires the account to be an administrator of the repository: #1263

[ryangribble]

Yeah I saw the existing test was skipped, I guess I was just questioning whether there should still be the pagination test written, then also skipped?

The code changes look fine though so 👍 if you aren't concerned about the missing test

[shiftkey]

@ryangribble good point. I'll add the test so we don't forget it and then close this out...