## Summary of the Pull Request
Currently, when the MRU is enabled we lose the keybinding allowing us to
go forward/backward (aka right/left in LTR) in the tab view.
To fix that, this PR introduces "tabSwitcherMode" optional parameter to
the prevTab / nextTab commands.
If it is not provided the global setting will be used.
So if you want to go to adjacent tabs, even if MRU is enabled on the
system level you can use:
```
{ "command": { "action": "prevTab", "tabSwitcherMode": "inOrder" }, "keys": "ctrl+f1"}
{ "command": { "action": "nextTab", "tabSwitcherMode": "inOrder" }, "keys": "ctrl+f2"}
```
or even
```
{"command": { "action": "prevTab", "tabSwitcherMode": "disabled" }, "keys": "ctrl+f1"}
{ "command": { "action": "nextTab", "tabSwitcherMode": "disabled" }, "keys": "ctrl+f2"}
```
if you don't want tab switcher to show up
<!-- Please review the items on the PR checklist before submitting-->
## PR Checklist
* [x] Closes https://github.com/microsoft/terminal/issues/9330
* [x] CLA signed.
* [x] Tests added/passed
* [ ] Documentation updated - not yet. Waiting for approval.
* [x] Schema updated.
* [ ] I've discussed this with core contributors already.
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