Refactor identity and http routing

cmd/rdpgw/config/configuration.go

cmd/rdpgw/identity/identity.go

cmd/rdpgw/identity/identity_test.go

cmd/rdpgw/identity/user.go

cmd/rdpgw/main.go

cmd/rdpgw/protocol/gateway.go

cmd/rdpgw/protocol/process.go

cmd/rdpgw/protocol/tunnel.go

cmd/rdpgw/security/basic_test.go

cmd/rdpgw/security/jwt.go

cmd/rdpgw/web/basic.go

cmd/rdpgw/web/context.go

cmd/rdpgw/web/oidc.go

cmd/rdpgw/web/router.go

cmd/rdpgw/web/session.go

cmd/rdpgw/web/web.go

cmd/rdpgw/web/web_test.go

go.mod