delta: add sidedata field to revision delta
When emitting revision delta, we need to also emit the sidedata information just
added in the revlogv2 format if appropriate.
Differential Revision: https://phab.mercurial-scm.org/D10027
[tool.black]
line-length = 80
exclude = '''
build/
| wheelhouse/
| dist/
| packages/
| \.hg/
| \.mypy_cache/
| \.venv/
| mercurial/thirdparty/
'''
skip-string-normalization = true
quiet = true