feat(*): add contributor guidelines

[Malaydewangan09]

No description provided.

[Copilot]

Pull Request Overview

This PR adds comprehensive contributor guidelines by introducing a PR checklist template and an automated workflow to validate checklist completion. The changes aim to standardize the contribution process and ensure quality standards are met before code review.

• Adds a detailed contributor checklist covering coding standards, testing, documentation, and plugin development requirements
• Implements automated workflow validation to enforce checklist completion for external contributors
• Creates dependency between checklist validation and the main CI pipeline

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
.github/workflows/main.yml	Adds checklist validation job that verifies PR checklist completion for non-organization members
.github/pull_request_template.md	Introduces comprehensive contributor guidelines checklist with sections for general practices, properties, HTTP, JSON, new plugins, tests, and outputs

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