feat: add oauth config setting to enable/disable pkce extension #100
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Describe the PR
Add Proof Key for Code Exchange Support configurable with the OAuthConfig struct.
Relation issue
#99
Additional context
OAuth2 clients that only support Authorization Code Flow with PKCE do not work with the current feature set of echo-swagger.
There is a flag for it in Swagger UI 3.24.0+: usePkceWithAuthorizationCodeGrant and these small changes fix the problem.