feat: add --experiments flag to replace --experimental (#5767)

- Deprecates the --experimental flag
- Adds a new flag --experiments which supports passing multiple comma-separated values or a wildcard value.
- Exposes a new endpoint /api/v2/experiments that returns the list of enabled experiments.
- Deprecates the field Features.Experimental in favour of this new API.
- Updates apidocgen to support type aliases (shoutout to @mtojek).
- Modifies apitypings to support generating slice types.
- Updates develop.sh to pass additional args after -- to $CODERD_SHIM.

coderd/coderdtest/authorize.go

@@ -48,6 +48,7 @@ func AGPLRoutes(a *AuthTester) (map[string]string, map[string]RouteCheck) {
 		"GET:/healthz":                  {NoAuthorize: true},
 		"GET:/api/v2":                   {NoAuthorize: true},
 		"GET:/api/v2/buildinfo":         {NoAuthorize: true},
+		"GET:/api/v2/experiments":       {NoAuthorize: true}, // This route requires AuthN, but not AuthZ.
 		"GET:/api/v2/updatecheck":       {NoAuthorize: true},
 		"GET:/api/v2/users/first":       {NoAuthorize: true},
 		"POST:/api/v2/users/first":      {NoAuthorize: true},

coderd/coderdtest/coderdtest.go

@@ -85,7 +85,6 @@ type Options struct {
 	AppHostname          string
 	AWSCertificates      awsidentity.Certificates
 	Authorizer           rbac.Authorizer
-	Experimental         bool
 	AzureCertificates    x509.VerifyOptions
 	GithubOAuth2Config   *coderd.GithubOAuth2Config
 	RealIPConfig         *httpmw.RealIPConfig