Resolves: #6436
Measurements of `poetry lock` with warm cache with example
pyproject.toml from #6436:
|test case|time in s|peak memory usage in MB|
|---|---|---|
|legacy repository (before)|422|113|
|legacy repository (after)|3|118|
|pypi repository|1|92|
`backports.cached-property` is used in order to support
cached_property on Python 3.7.
Co-authored-by: Jarrod Moore <jmo@jmo.name>
Co-authored-by: Bjorn Neergaard <bjorn@neersighted.com>
