Fixes for Nuclick Transform (#5563)

Fixes # .

### Description

- Make the current nuclick transform tensor enabled.  
- Add option to use Gaussian Filter over user clicks.
- Option to choose initial seed point based on distance transform
instead of random
- Optimize patch/boundary box creation logic for nuclei cells
- The same transform should be useful to create an interactive nuclick
classification model

### Types of changes
<!--- Put an `x` in all the boxes that apply, and remove the not
applicable items -->
- [x] 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).
- [x] New tests added to cover the changes.
- [ ] Integration tests passed locally by running `./runtests.sh -f -u
--net --coverage`.
- [x] Quick tests passed locally by running `./runtests.sh --quick
--unittests --disttests`.
- [x] In-line docstrings updated.
- [ ] Documentation updated, tested `make html` command in the `docs/`
folder.

Signed-off-by: Sachidanand Alle <sachidanand.alle@gmail.com>

Author: SachidanandAlle