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/environment/environment-variables.ts

@@ -225,6 +225,15 @@ export class EnvironmentVariables {
   @ValidateIf((env) => env.AUTH_GOOGLE_ENABLED)
   AUTH_GOOGLE_CALLBACK_URL: string;
 
+  @CastToBoolean()
+  @IsOptional()
+  @IsBoolean()
+  AUTH_SSO_ENABLED = false;
+
+  @IsString()
+  @IsOptional()
+  ENTERPRISE_KEY: string;
+
   // Custom Code Engine
   @IsEnum(ServerlessDriverType)
   @IsOptional()
@@ -443,6 +452,9 @@ export class EnvironmentVariables {
   @CastToPositiveNumber()
   CACHE_STORAGE_TTL: number = 3600 * 24 * 7;
 
+  @ValidateIf((env) => env.ENTERPRISE_KEY)
+  SESSION_STORE_SECRET: string;
+
   @CastToBoolean()
   CALENDAR_PROVIDER_GOOGLE_ENABLED = false;