feat(sso): allow to use OIDC and SAML (#7246)

## What it does
### Backend
- [x] Add a mutation to create OIDC and SAML configuration
- [x] Add a mutation to delete an SSO config
- [x] Add a feature flag to toggle SSO
- [x] Add a mutation to activate/deactivate an SSO config
- [x] Add a mutation to delete an SSO config
- [x] Add strategy to use OIDC or SAML
- [ ] Improve error management

### Frontend
- [x] Add section "security" in settings
- [x] Add page to list SSO configurations
- [x] Add page and forms to create OIDC or SAML configuration
- [x] Add field to "connect with SSO" in the signin/signup process
- [x] Trigger auth when a user switch to a workspace with SSO enable
- [x] Add an option on the security page to activate/deactivate the
global invitation link
- [ ] Add new Icons for SSO Identity Providers (okta, Auth0, Azure,
Microsoft)

---------

Co-authored-by: Félix Malfait <felix@twenty.com>
Co-authored-by: Charles Bochet <charles@twenty.com>

packages/twenty-server/src/engine/core-modules/feature-flag/enums/feature-flag-key.enum.ts

@@ -10,6 +10,7 @@ export enum FeatureFlagKey {
   IsMessageThreadSubscriberEnabled = 'IS_MESSAGE_THREAD_SUBSCRIBER_ENABLED',
   IsQueryRunnerTwentyORMEnabled = 'IS_QUERY_RUNNER_TWENTY_ORM_ENABLED',
   IsWorkspaceFavoriteEnabled = 'IS_WORKSPACE_FAVORITE_ENABLED',
+  IsSSOEnabled = 'IS_SSO_ENABLED',
   IsGmailSendEmailScopeEnabled = 'IS_GMAIL_SEND_EMAIL_SCOPE_ENABLED',
   IsAnalyticsV2Enabled = 'IS_ANALYTICS_V2_ENABLED',
   IsUniqueIndexesEnabled = 'IS_UNIQUE_INDEXES_ENABLED',