Add multi-tenant support for materialized views

[niteshpurohit]

Feature Request

Description:

Add support for multi-tenancy, allowing materialized views to be scoped to a specific tenant (e.g., by a schema name or a tenant ID column).

Use Case:

In SaaS applications, data is often partitioned by tenant. This feature would allow the gem to manage materialized views within each tenant's namespace or schema correctly.

Proposed Solution:

• Allow an optional tenant_id or schema_name to be associated with a MatViewDefinition.
• All operations (refreshing, querying) must be performed within the context of the correct tenant.
• This may involve using Apartment or similar gems, or setting search_path in PostgreSQL.

RSpec Tests:

• Set up two tenants (e.g., two schemas).
• Create a view definition with the same name in each tenant.
• Trigger a refresh for the view in tenant 1.
• Verify that the view in tenant 1 is refreshed, but the view in tenant 2 is not.

Checklist:

• I have searched for a similar feature request and didn't find any duplicates.
• I have included all the required information.
• I have tagged the issue with the label "enhancement".

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