feat(conda): detect licenses for environment.yml

[DmitriyLewen]

Description

We can detect licenses from /opt/conda/envs/*/conda-meta/*.json files

[DmitriyLewen]

AFter inverstigation i realize that using /opt/conda/envs/*/conda-meta dir is unstable.
You can use prefix field to set directory for conda-meta (see https://conda.io/projects/conda/en/latest/user-guide/tasks/manage-environments.html#specifying-a-location-for-an-environment):

(/test) root@b02de14be7f3:/# conda env list
# conda environments:
#
base                     /opt/conda
                      *  /test

(/test) root@b02de14be7f3:/# ls -hl /opt/conda/envs/
total 0
(/test) root@b02de14be7f3:/# ls -hl /test/conda-meta/
total 3.0M
-rw-r--r-- 1 root root  866 Jun 19 10:21 _libgcc_mutex-0.1-main.json
-rw-r--r-- 1 root root 1.2K Jun 19 10:21 _openmp_mutex-5.1-1_gnu.json
...

But environment.yml contains prefix field. We can use this field to find conda-meta dir.