Bibo-Joshi changed the title ~~Change to src Layout~~ Rework Repository to src Layout

Pull Request Overview

This PR reworks the repository layout to use a src-based structure, moving package code from telegram to src/telegram.

Update configuration in pyproject.toml for versioning, builds, linting, testing, and type checking.
Adjust CI workflows to use the new src/telegram path.
Update contribution documentation to reflect the new layout.

Copilot reviewed 232 out of 232 changed files in this pull request and generated 1 comment.

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File	Description
pyproject.toml	Updated package paths and build configurations
changes/unreleased/4798.g7G3jRf2ns4ath9LRFEcit.toml	Added changelog entry for the repository rework
.github/workflows/unit_tests.yml	Updated test path to src/telegram
.github/workflows/type_completeness.yml	Updated test path to src/telegram
.github/workflows/test_official.yml	Updated test path to src/telegram
.github/workflows/docs-admonitions.yml	Updated test path to src/telegram
.github/CONTRIBUTING.rst	Extended instructions to reflect the new src layout