Support arbitrary build directories

[rossburton]

Issue Kind

Change in current behaviour

Description

When building code with poetry.core I really want to know that the build tree is pristine, so the ability to tell poetry.core to use a specific directory as the build tree (instead of hardcoding build under the project, see https://github.com/python-poetry/poetry-core/blob/15814280a9f0be19aaf7d9ba09d16d6a9e37fff5/src/poetry/core/masonry/builders/wheel.py#L216) would be useful.

Notably, Bluetooth-Devices/dbus-fast#330 is because a build tree is being reused.

Impact

Improves build quality by ensuring the build tree is pristine.

Workarounds

None.

[dimbleby]

per #2740, this whole feature is not really supported.

Recommend that if this is important to you then the best chance of success would be to submit a pull request.