feat!: Allow passing client data through g8.data context key (#36)

* feat!: Allow passing client data through g8.data context key

This adds the Data field to the Client struct

* docs: Fix comment for AuthorizationService.Authorize

* chore: Rename tests to match method refactors

test: Support concurrent map access on custom cache test

feat(gate): Add Gate.PermissionMiddleware

chore: Update Go to 1.19

feat: Add ExtractTokenFromRequest method in Gate struct

Add custom token extractor (#7)

* Minor update

* Add custom token extractor

* Improve some examples in documentation

Add missing vendor folder

⚠ Migrate TwinProduction/g8 to TwiN/g8

Close #3: Add support for rate limiting

Gate.ProtectFuncWithPermission should return http.HandlerFunc instead…

… of http.Handler