Add optional terminal numbers to toggle term

[kraxli]

enhance #300 by providing (optional) terminal number

e.g. key stroke 4tp with open python in terminal number 4

[mehalter]

Thanks for the contribution! @kraxli could you please rebase your commits into a single commit. We are not allowing any merge commits in main to keep a linear commit log.

[mehalter]

Looks pretty great! I suggested one line change and other than that I just need you to rebase the commits back down to a single commit instead of having merge and revert commits.

[mehalter]

Thanks for rebasing, its quite close. Can you please drop the unrelated commit that changes bufferline autocommands. Seems to be a problem with the Rebase.

[kraxli]

thanks, I followed your suggestion. Hope it fits now :-)

[mehalter]

LGTM