Support updating environment variables

The idea:
1. Get `prev_env = $(env)` before running the sh-command
2. Run sh-command. Example `! export QWE=123`.
3. Add saving env at the end of command: `! export QWE=123 ; env > /tmp/post_env`.
4. By comparing `prev_env` and `post_env` update the environment in the current session i.e. `$QWE='123'`

## For community
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