Casing: Canonical name for Csharp.

[Shubham8287]

2.0 Breaking change:

Convert existing name to accessor

Not breaking(but nice to have in 2.0);

Usee name for canonical names.

We want to support canonical name overrides for tables, reducers, views, procedures, and indexes, as described in the proposal.

Modules should provide these canonical names through the ExplicitNames section of RawModuleDefV10, as outlined in the code commentary in this PR:
#4294

Also provide the way to choose the casing setting and pass it me RawModuleDefV10 : CaseConversionPolicy section

public partial class Module
{
    [SpacetimeDB.Settings]
    public const CaseConversionPolicy CASE_CONVERSION_POLICY = CaseConversionPolicy.SnakeCase;
}