Peter Rodenkirch

feat: add oauth config setting to enable/disable pkce extension

1

**Describe the PR** Add Proof Key for Code Exchange Support configurable with the OAuthConfig struct. **Relation issue** https://github.com/swaggo/echo-swagger/issues/99 **Additional context** OAuth2 clients that only support Authorization Code Flow with PKCE...

Similar to the issue #243 in the gin-swagger repo, and https://github.com/swaggo/swag/issues/871: **Is your feature request related to a problem? Please describe.** OAuth2 clients that only support Authorization Code Flow with...