feat(plugins/term_tab): MacOS support for completion of zsh sessions working directory

[Simske]

Standards checklist:

• The PR title is descriptive.
• The PR doesn't replicate another PR which is already open.
• I have read the contribution guide and followed all the instructions.
• The code follows the code style guide detailed in the wiki.
• The code is mine or it's from somewhere with an MIT-compatible license.
• The code is efficient, to the best of my ability, and does not waste computer resources.
• The code is stable and I have tested it myself, to the best of my abilities.

Changes:

• Extended term_tab plugin to work on Mac
• Updated Readme of plugin term_tab

Other comments:

The term_tab plugin only Linux and Solaris hosts, as the logic is OS specific.
This adds the same functionality for MacOS.

Tested on MacOS 12.2.1 ARM, zsh 5.8 (x86_64-apple-darwin21.0)