feat: rename Custom Type-related methods to include "CustomType"

[angeloashmore]

Types of changes

• Chore (a non-breaking change which is related to package maintenance)
• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

This PR renames all Custom Type-related methods could include a "CustomType" identifier, just like the Shared Slice-related methods.

The existing methods are still included in the client as aliases, but are deprecated. Please upgrade to the renamed methods.

Old:

const customTypeModels = await client.getAll();
const sharedSliceModels = await client.getAllSharedSlices();

New:

const customTypeModels = await client.getAllCustomTypes();
const sharedSliceModels = await client.getAllSharedSlices();

Closes #1

Checklist:

• My change requires an update to the official documentation.
• All TSDoc comments are up-to-date and new ones have been added where necessary.
• All new and existing tests are passing.

🐭