Support process report

[junnplus]

https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#progress

[SuperAuguste]

There's no real use for this at the moment as we do everything in a single thread. A good start could be to split out our build file compilation logic into a worker pool and use this for that.

[junnplus]

Actually, this issue originated from:

Possibly during the first request, zls was not ready yet. In the previous design, the LspProgressUpdate event notification was used to trigger a second request. However, it appears that zls did not notify properly.

zls/src/Server.zig

Line 1423 in 33121da

if (std.mem.eql(u8, method, "$/progress")) break :blk;

Originally posted by @junnplus in junnplus/lsp-setup.nvim#49 (comment)