feat(template): add template getMany and get methods [DX-898] [DX-899]

[Michael Pham (michaelphamcf)]

Summary

• Adds getMany and get methods for the Template entity (DX-898, DX-899)
• Sets up all structural wiring for the Template entity in the SDK type system (DX-898)

Description

DX-898 — getMany:

• Creates lib/adapters/REST/endpoints/template.ts with getMany (GET /templates)
• Registers Template in lib/adapters/REST/endpoints/index.ts
• Adds Template MRActions block and MakeRequest overloads to lib/common-types.ts
• Creates lib/plain/entities/template.ts with TemplatePlainClientAPI
• Wires template.getMany in lib/plain/plain-client.ts and lib/plain/plain-client-types.ts
• 3 unit tests

DX-899 — get:

• Adds get to the adapter (GET /templates/:templateId)
• Extends TemplatePlainClientAPI, MRActions, MakeRequest overloads, and plain-client.ts
• 1 unit test

This branch is based on feat/exo with feat/dx-897-scaffold-template-entity merged in.

PR Checklist

• I have read the CONTRIBUTING.md file
• All commits follow conventional commits
• Documentation is updated (if necessary)
• PR doesn't contain any sensitive information
• There are no breaking changes

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