feat(bitbucket): add inline PR comment support for specific lines and files

[mrcrysta1]

Summary

Adds add_pull_request_inline_comment() method for Bitbucket Server / Data Center REST API, resolving #1439.

This enables adding comments on specific lines or entire files within a pull request diff — a feature previously missing from the Python SDK.

Changes

• New method: add_pull_request_inline_comment() in Bitbucket class (atlassian/bitbucket/__init__.py)
• 4 new tests: RANGE comments, COMMIT line-level comments, threaded replies, custom srcPath for renamed files

Usage

from atlassian import Bitbucket

bb = Bitbucket(url="https://bitbucket.example.com", username="admin", password="secret")

# Line-level comment on a specific line
bb.add_pull_request_inline_comment(
    project_key="PRJ",
    repository_slug="my-repo",
    pull_request_id=42,
    text="This line has a potential null reference",
    path="src/main.py",
    from_hash="abc123",
    to_hash="def456",
    line=15,
    line_type="ADDED",
    diff_type="COMMIT",
    file_type="TO",
)

# Whole-file comment
bb.add_pull_request_inline_comment(
    project_key="PRJ",
    repository_slug="my-repo",
    pull_request_id=42,
    text="Overall great refactor!",
    path="src/utils.py",
    from_hash="abc123",
    to_hash="def456",
    diff_type="RANGE",
)

Parameters

Parameter	Description
path	File path relative to repo root
from_hash	Source commit hash (branch HEAD before PR)
to_hash	Target commit hash (branch HEAD after PR)
line	Line number (required for diffType=COMMIT)
line_type	ADDED, REMOVED, or CONTEXT
diff_type	RANGE (whole-file) or COMMIT (line-level)
file_type	FROM or TO — which side of the diff
src_path	Original file path (for renamed files, defaults to path)
parent_id	Parent comment ID for threaded replies

Tests

All 15 tests passing (11 existing + 4 new). Lint clean.

Closes

Closes #1439

---

This is my first contribution to this project. AI assistance (GitHub Copilot) was used for code generation and documentation. All code has been reviewed and tested locally before submission.

[codecov]

Codecov Report

❌ Patch coverage is 4.16667% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.61%. Comparing base (6f49a1a) to head (b8be914).
⚠️ Report is 27 commits behind head on master.

Files with missing lines	Patch %	Lines
atlassian/bitbucket/__init__.py	4.16%	23 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1662      +/-   ##
==========================================
+ Coverage   59.74%   60.61%   +0.87%     
==========================================
  Files         101      106       +5     
  Lines       16868    18059    +1191     
  Branches     1746     1845      +99     
==========================================
+ Hits        10077    10947     +870     
- Misses       6393     6650     +257     
- Partials      398      462      +64     

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