Fixes #61914

Allow for finer control over how requests are queued

Remove 'new' and rewording text in README.md

Fixed spelling mistakes

And that tasks wait for terminal process ready before checking to see if task process ended to fire

Related #58828

Fixes #61394

Fixes #61816

Fixes #61815

#54972

Instead of having a generic `Retrigger` reason, add a new field on the `SignatureHelpContext` that tracks if this was a retrigger or not. This allows retrigger for all the different trigger reasons, including invoke.

Replace the old `Retriggger` trigger reason with `ContentChange` which tracks cursor movement and text updates.

#50334

fixes #50334