Add support for VS Code Inlay Hints

[modscleo4]

Feature description or problem with existing feature
There is an extension called VS Code Inline Parameters (https://github.com/imliam/vscode-inline-parameters), but it's super slow and CPU heavy. VS Code 1.60 added native support for Inlay Hints (and JS/TS already have it). I didn't find any issue related to Inlay or Inline, so I opened one.

Describe the solution you'd like
In JS/TS, it shows hints for Enums, function return types, parameter names, parameter types, property types and variable types.

Additional context

[kanlukasz]

We can call it PARAMETER HINT feature
And yes, it's a great idea. It would be great to have this feature in Intelephense

PS. There is an add-on like https://marketplace.visualstudio.com/items?itemName=robertgr991.php-parameter-hint but at first glance not work properly

[TimWolla]

If I understand it correctly the necessary API within VS Code has been finalized:

microsoft/vscode#16221 (comment)

[modscleo4]

The Inlay Hint provider API is now finalized on VS Code 1.65

[modscleo4]

Unfortunately, this needs modifications on the LSP Server, which is (at least I think) closed source. Java people managed to implement inlay hints both on client and server, these are the Pull Requests: https://github.com/eclipse/eclipse.jdt.ls/pull/2019/files https://github.com/redhat-developer/vscode-java/pull/2354/files

I managed to adapt the client, but this will not work without the required modifications in the server https://github.com/modscleo4/vscode-intelephense

[Vincent-HD]

Any news on this ? This would be a awesome feature to have :D

[opdavies]

It would be great to see this available in Intelephense now Neovim 0.10 has been released with support for inlay hints.

[TaylorJonesTRT]

I am also hoping this will be added in! After recently purchasing a license I was disappointed to not see an inlay hint feature for any editor that this can be used in (im using neovim).