Added withFreshTokensPerformActionWithAdditionalParameters to OIDAuthState

[CraigLn]

This PR adds a way to include additional parameters when a token needs to be refreshed. This way previously only achievable by constructing the request, performing the refresh, and updating the auth state manually.

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This change is

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Current coverage is 75.27% (diff: 0.00%)

Merging #49 into master will decrease coverage by 0.07%

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[WilliamDenniss]

Thanks for the pull request @ProjectLane.

Can you eSign the CLA & contributor agreement so we can merge it in?

[CraigLn]

@WilliamDenniss Sorry for the delay. I just signed the documents, but let me know if anything was missed. Thank you!

[WilliamDenniss]

Reviewed 2 of 2 files at r1.
Review status: all files reviewed at latest revision, 2 unresolved discussions, some commit checks failed.

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Source/OIDAuthState.h, line 216 at r1 (raw file):

        thread.
 */
- (void)withFreshTokensPerformActionWithAdditionalParameters:

Can you name this:

performActionWithFreshTokens:(OIDAuthStateAction)action additionalRefreshParameters:(nullable NSDictionary<NSString *, NSString *> *)additionalParameters

Two reasons:

1. I think it's best to say additional_Refresh_Param to be clear the params relate to the refresh, and
2. I plan to rename withFreshTokensPerformAction to performActionWithFreshTokens based on some other feedback – may as well not add a new method with the old naming style.

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Source/OIDAuthState.m, line 444 at r1 (raw file):

    // refresh the tokens
    OIDTokenRequest *tokenRefreshRequest =
      [self tokenRefreshRequestWithAdditionalParameters:additionalParameters];

This should be indented by 4 space characters not 2, since it's a line wrap.

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Comments from Reviewable

[WilliamDenniss]

Thanks for signing the CLA! I've reviewed your PR, see comments.

[WilliamDenniss]

Merged as part of #55.