Avoid spawning Conda to get list of environments and conda version

[DonJayamanne]

Based on the following source code for Conda
list_all_known_prefixes

We can get all the environments from

• the environments txt file
• envs folder

The conda version can be extracted from the conda-meta folder for conda-<version>*.json file

[DonJayamanne]

@karthiknadig
I'll implement this in the new Native_locator.

[karthiknadig]

Do we want to adopt this into TS discovery? The plan is to get rid of the entire TS discover and resolve infrastructure eventually.

[DonJayamanne]

Fixed in the native locator.