Standardized module names and added module-test-cs based on module-test

[cloutiertyler]

Description of Changes

This does the following renames:

/modules/rust-wasm-test -> /modules/module-test
/modules/spacetimedb-quickstart-cs -> /modules/module-test-cs

Additionally, I've removed /modules/spacetimedb-quickstart-cs and copied the contents into /modules/module-test taking care to update references in the tests.

Then I implemented the missing functionality in /modules/module-test-cs to make it as equivalent as possible to /modules/module-test, although it is not possible to match functionality as several small things are missing from the C# module implementation.

API and ABI breaking changes

No breaking changes.

Expected complexity level and risk

1.5 In principle only renames, but could potentially break testing.

Testing

Describe any testing you've done, and any testing you'd like your reviewers to do,
so that you're confident that all the changes work as expected!

• I ran dotnet build on /modules/module-test-cs
• I ran cargo test --all

[joshua-spacetime]

Looks as expected. I've noted the disparities you've highlighted so that we can create tickets for them.