Allow to handle autoclosed characters differently (#8666)

Adds the `always_treat_brackets_as_autoclosed` setting to control how
the autoclosed characters are handled.

The setting is off by default, meaning the behaviour stays the same
(following how VSCode handles autoclosed characters).
When set to `true`, the autoclosed characters are always skipped over
and auto-removed no matter how they were inserted (following how Sublime
Text/Xcode handle this).


https://github.com/zed-industries/zed/assets/471335/304cd04a-59fe-450f-9c65-cc31b781b0db


https://github.com/zed-industries/zed/assets/471335/0f5b09c2-260f-48d4-8528-23f122dee45f

Release Notes:

- Added the setting `always_treat_brackets_as_autoclosed` (default:
`false`) to always treat brackets as "auto-closed" brackets, i.e.
deleting the pair when deleting start/end, etc.
([#7146](https://github.com/zed-industries/zed/issues/7146)).

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Co-authored-by: Thorsten Ball <mrnugget@gmail.com>