Add GitHub App processor for installation token auth#52
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GitHub Apps use a bespoke flow (JWT in the Authorization header, not an OAuth2 form body) that JWTProcessorConfig can't express. This adds GitHubAppProcessorConfig following the same sealed two-step pattern: sign a 10-minute RS256 JWT, exchange it for an installation token, and return a SealedTokenResponse whose inner InjectProcessorConfig is pinned to api.github.com with a "token %s" Authorization format - so neither the private key nor the installation token is ever plaintext outside tokenizer's process memory.
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GitHub Apps use a bespoke flow (JWT in the Authorization header, not an OAuth2 form body) that JWTProcessorConfig can't express. This adds GitHubAppProcessorConfig following the same sealed two-step pattern: sign a 10-minute RS256 JWT, exchange it for an installation token, and return a SealedTokenResponse whose inner InjectProcessorConfig is pinned to api.github.com with a "token %s" Authorization format - so neither the private key nor the installation token is ever plaintext outside tokenizer's process memory.