feat(auth/oidc): Use BadRequest response for state mismatches, enhance logging with context

[carstendietrich]

Using HTTP status code 500 for all issues occurring during the OIDC flow might not be the best way. Therefore changing at least the errors that can occur during the callback e.g. tinkered/missing state param as HTTP status 400.

Additionally extending the web responder with error funcs that also take the ctx to enhance the logging for better traceability.

[github-actions]

Package	Line Rate	Health
flamingo.me/flamingo/v3	0%	❌
flamingo.me/flamingo/v3/core/auth	13%	❌
flamingo.me/flamingo/v3/core/auth/example/custom	0%	❌
flamingo.me/flamingo/v3/core/auth/example	0%	❌
flamingo.me/flamingo/v3/core/auth/fake	50%	➖
flamingo.me/flamingo/v3/core/auth/http	40%	❌
flamingo.me/flamingo/v3/core/auth/mock	0%	❌
flamingo.me/flamingo/v3/core/auth/oauth	49%	❌
flamingo.me/flamingo/v3/core/cache	65%	➖
flamingo.me/flamingo/v3/core/gotemplate	87%	✔
flamingo.me/flamingo/v3/core/healthcheck/domain/healthcheck	0%	❌
flamingo.me/flamingo/v3/core/healthcheck/interfaces/controllers	76%	✔
flamingo.me/flamingo/v3/core/healthcheck	66%	➖
flamingo.me/flamingo/v3/core/internalauth/application	88%	✔
flamingo.me/flamingo/v3/core/internalauth	100%	✔
flamingo.me/flamingo/v3/core/locale/application	87%	✔
flamingo.me/flamingo/v3/core/locale/domain	75%	✔
flamingo.me/flamingo/v3/core/locale/infrastructure/fake	75%	✔
flamingo.me/flamingo/v3/core/locale/infrastructure	0%	❌
flamingo.me/flamingo/v3/core/locale/interfaces/controllers	100%	✔
flamingo.me/flamingo/v3/core/locale/interfaces/templatefunctions	92%	✔
flamingo.me/flamingo/v3/core/locale	59%	➖
flamingo.me/flamingo/v3/core/oauth/application	4%	❌
flamingo.me/flamingo/v3/core/oauth/application/fake	50%	➖
flamingo.me/flamingo/v3/core/oauth/domain	62%	➖
flamingo.me/flamingo/v3/core/oauth/example	0%	❌
flamingo.me/flamingo/v3/core/oauth/infrastructure	0%	❌
flamingo.me/flamingo/v3/core/oauth/interfaces	1%	❌
flamingo.me/flamingo/v3/core/oauth/interfaces/fake	0%	❌
flamingo.me/flamingo/v3/core/oauth	55%	➖
flamingo.me/flamingo/v3/core/requestlogger	100%	✔
flamingo.me/flamingo/v3/core/requesttask	10%	❌
flamingo.me/flamingo/v3/core/robotstxt/interfaces	0%	❌
flamingo.me/flamingo/v3/core/robotstxt	50%	➖
flamingo.me/flamingo/v3/core/runtime	77%	✔
flamingo.me/flamingo/v3/core/security/application/role	95%	✔
flamingo.me/flamingo/v3/core/security/application	98%	✔
flamingo.me/flamingo/v3/core/security/application/voter	100%	✔
flamingo.me/flamingo/v3/core/security/domain	17%	❌
flamingo.me/flamingo/v3/core/security/interface/controller	100%	✔
flamingo.me/flamingo/v3/core/security/interface/middleware	72%	➖
flamingo.me/flamingo/v3/core/security	59%	➖
flamingo.me/flamingo/v3/core/silentzap	0%	❌
flamingo.me/flamingo/v3/core/zap	81%	✔
flamingo.me/flamingo/v3/examples/hello-world	0%	❌
flamingo.me/flamingo/v3/framework/cmd	12%	❌
flamingo.me/flamingo/v3/framework/config	49%	❌
flamingo.me/flamingo/v3/framework/controller	0%	❌
flamingo.me/flamingo/v3/framework/flamingo	40%	❌
flamingo.me/flamingo/v3/framework/flamingo/healthcheck	0%	❌
flamingo.me/flamingo/v3/framework	28%	❌
flamingo.me/flamingo/v3/framework/opencensus	88%	✔
flamingo.me/flamingo/v3/framework/prefixrouter	43%	❌
flamingo.me/flamingo/v3/framework/systemendpoint/application	0%	❌
flamingo.me/flamingo/v3/framework/systemendpoint	27%	❌
flamingo.me/flamingo/v3/framework/testutil	0%	❌
flamingo.me/flamingo/v3/framework/web	48%	❌
flamingo.me/flamingo/v3/framework/web/filter	2%	❌
Summary	42% (3504 / 8362)	❌

[tessig]

lgtm