feat(gnofaucet): Github middleware with cooldown

[Villaquiranm]

related to #3781
Related faucet-hub PR:
gnolang/faucet-hub#41

This pull request introduces two key features to gnofaucet:

getGithubMiddleware: A new middleware that checks for a code query parameter in the URL. It attempts to exchange this code for a GitHub token via OAuth. If the code is valid, the middleware retrieves the GitHub login associated with the token.

Cooldown Period: This feature allows for a configurable cooldown period (1 hour in this case). If the user attempts to claim tokens again before the cooldown period expires, the middleware will reject the request.

Additionally, we could enhance the functionality by implementing checks for account age, pull requests, commits, or verifying if the user belongs to a specific organization.

screen-capture.8.webm

[Gno2D2]

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Codecov Report

Attention: Patch coverage is 0% with 87 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
contribs/gnofaucet/gh.go	0.00%	57 Missing ⚠️
contribs/gnofaucet/cooldown.go	0.00%	15 Missing ⚠️
contribs/gnofaucet/serve.go	0.00%	15 Missing ⚠️

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