feat: add Template create, update, and delete methods [DX-900] [DX-901] [DX-902]

[Michael Pham (michaelphamcf)]

Summary

Adds create, update, and delete methods for the Template entity (DX-900, DX-901, DX-902).

Description

DX-900 — create:

• Adds create to lib/adapters/REST/endpoints/template.ts (POST /templates)
• Adds create to Template MRActions and MakeRequest overload in lib/common-types.ts
• Adds create to TemplatePlainClientAPI in lib/plain/entities/template.ts
• Wires template.create in lib/plain/plain-client.ts
• 1 unit test

DX-901 — update:

• Adds update to lib/adapters/REST/endpoints/template.ts (PUT /templates/:templateId)
• Sends X-Contentful-Version header from sys.version for optimistic locking
• Adds update to Template MRActions and MakeRequest overload in lib/common-types.ts
• Adds update to TemplatePlainClientAPI in lib/plain/entities/template.ts
• Wires template.update in lib/plain/plain-client.ts
• 1 unit test

DX-902 — delete:

• Adds del to lib/adapters/REST/endpoints/template.ts (DELETE /templates/:templateId)
• Adds delete to Template MRActions and MakeRequest overload in lib/common-types.ts
• Adds delete to TemplatePlainClientAPI in lib/plain/entities/template.ts
• Wires template.delete in lib/plain/plain-client.ts
• 1 unit test

This branch is based on feat/exo with feat/dx-897-scaffold-template-entity and feat/dx-898-899-template-getmany-get merged in.

Motivation and Context

Template is an ExO entity for instantiating Experiences. This continues the incremental SDK wrapper series (DX-897–904) adding write and delete capabilities after the read methods from DX-898/899.

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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