feat: add wipp to ict conversion

[camilovelezr]

To be merged after #4

This PR adds a new directory tools/conversions that will contain tools to convert plugins from/to different formats.

This PR adds a new polus.tools.conversions.wipp_to_ict() function to convert from WIPP manifest to ICT Yaml:

from polus.tools.conversions import wipp_to_ict
from polus.tools import plugins

plugins.list
# ['ApplyFlatfield', 'ImageAssembler', 'Montage']

plugins.ApplyFlatfield
# Plugin(name='Apply Flatfield', version=2.0.1-dev0)

from polus.tools.conversions import wipp_to_ict

wipp_to_ict(plugins.ApplyFlatfield, "/Users/camilovelezr/flatfield.yaml")

# (ICT(...), PosixPath('/Users/camilovelezr/flatfield.yaml'))

Basic usage:
wipp_to_ict(wipp, out_path)
wipp is one of [polus.tools.plugins.Plugin, str, Path] . If str or Path: points to a WIPP plugin manifest.
out_path is the path (str or Path) where the ICT yaml will be saved

wipp_to_ict() returns: tuple[ICT, Path]