[TASK] Stop supporting unused arrays in Registries

[alainncls]

3 of our Registries have arrays to keep track of the number of items they registered.
While this can be useful to easily get the number of items they registered, this data can easily be accessed off chain via the subgraph.
Also, this can lead to "Gas-Griefing Vulnerability" in some cases.

Tasks

While we can't just delete the variable itself (the Registries being Upgradeable), we should keep the variables but stop using them (pushing into the arrays, reading from the arrays, deleting from the array, etc.)

• Stop supporting the moduleAddresses array in the ModuleRegistry
• Stop supporting the portalAddresses array in the PortalRegistry
• Stop supporting the schemaIds array in the SchemaRegistry
• Change the getModulesNumber function of the SDK to rely on the subgraph instead of the contract
• Change the getPortalsCount function of the SDK to rely on the subgraph instead of the contract
• Change the getSchemasNumber function of the SDK to rely on the subgraph instead of the contract