Is your feature request related to a problem? Please describe.
Numerous lints come with an auto-fix option, but we have to apply the fixes almost one by one, which is tedious.

Describe the solution you'd like
Since VS code already keeps tracks of the list of issues and offers to fix them, VS code could expose a command for "apply all fixes".

Similarly, we could have an option to, right before executing dartfmt, apply fixes for the file.

Describe alternatives you've considered
N/A

Additional context
N/A