Fixes #8205 .

Description

Try to add quantization, calibration and pruning to MONAI to enable a better inference performance.
With these functions added, model inference is expected to be faster. And we expect an inconspicuous precision loss.

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• Breaking change (fix or new feature that would cause existing functionality to change).
• New tests added to cover the changes.
• Integration tests passed locally by running ./runtests.sh -f -u --net --coverage.
• Quick tests passed locally by running ./runtests.sh --quick --unittests --disttests.
• In-line docstrings updated.
• Documentation updated, tested make html command in the docs/ folder.