Add the customization for the TenantHasAuthoritiesFunctionDefinitionEnricher type to simplify policy conditions

[starnowski]

Add the customization for the TenantHasAuthoritiesFunctionDefinitionEnricher type to simplify policy conditions.

AC:
The goal is to add new type that implements com.github.starnowski.posmulten.postgresql.core.rls.TenantHasAuthoritiesFunctionInvocationFactory.
The returnTenantHasAuthoritiesFunctionInvocation method should return a simple condition statement that compares tenant column id with the value from a function that returns the current tenant value.
For example:
tenant_id = get_current_tenant_id()
Generated policies should look like below:
USING (tenant_id = get_current_tenant_id())
WITH CHECK (tenant_id = get_current_tenant_id());