Construct custom request implementation

[PizieDust]

Construct

Introduction

This PR implements the Construct Custom Requests.

UX

Trigger this request using Alt+C on a typedhole to select possible construct values. If you select a value with more typedholes, it will continuously display more construct values.

You may also trigger this request from the general commands menu.

Notifications

• Ocamllsp warning: If ocamllsp is not running at the time the command is invoked, this notification is displayed.
• No support for requests: If the version of ocamllsp doesn't publish the ocamllsp/handleConstruct capability then this notification is displayed.

Commands

One command is published ocaml.construct which triggers the process.

Key bindings

The key binding Alt+C triggers this command.

Demo

ocaml.construct.mp4

References

• QuickPick : https://code.visualstudio.com/api/ux-guidelines/quick-picks

cc @voodoos

[voodoos]

Thanks Pizie, it's already in a very good state :-)

[voodoos]

Thanks for the changes, this looks good to go!