Add a new option to mute the hover response.

[voodoos]

As far as I know it is not possible to disable the default hover provider on the client side in vscode due to how the official LSP client implementation manage it.

However it is sometimes necessary to disable that hover provider to provide alternative information in the hover tooltips without additional clutter.

This PR introduces an option that allows the client to ask the server to not return anything when hover requests are made.

The diff is a bit larger than necessary because dune build @lint had not been run when options when last updated so the inlining has changed a bit.

The first use case for this option is described in this vscode-ocaml-platform PR: ocamllabs/vscode-ocaml-platform#1675

[coveralls]

Pull Request Test Coverage Report for Build 4650

Details

• 6 of 40 (15.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.04%) to 22.175%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
ocaml-lsp-server/src/ocaml_lsp_server.ml	4	5	80.0%
ocaml-lsp-server/src/config_data.ml	2	35	5.71%

Totals
Change from base Build 4649:	0.04%
Covered Lines:	5651
Relevant Lines:	25484

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💛 - Coveralls

[xvw]

Wow configuration capabilities are hard!