feat: add bacon-ls support (#3160)

Signed-off-by: Bigo <[email protected]>

Author: crisidev

lua/lspconfig/server_configurations/bacon_ls.lua

@@ -0,0 +1,39 @@
+local util = require 'lspconfig.util'
+
+return {
+  default_config = {
+    cmd = { 'bacon-ls' },
+    filetypes = { 'rust' },
+    root_dir = util.root_pattern('.bacon-locations', 'Cargo.toml'),
+    single_file_support = true,
+    settings = {},
+  },
+  docs = {
+    description = [[
+https://github.com/crisidev/bacon-ls
+
+A Language Server Protocol wrapper for [bacon](https://dystroy.org/bacon/).
+It offers textDocument/diagnostic and workspace/diagnostic capabilities for Rust
+workspaces using the Bacon export locations file.
+
+It requires `bacon` and `bacon-ls` to be installed on the system using
+[mason.nvim](https://github.com/williamboman/mason.nvim) or manually:util
+
+```sh
+$ cargo install --locked bacon bacon-ls
+```
+
+Settings can be changed using the `settings` dictionary:util
+
+```lua
+settings = {
+    -- Bacon export filename, default .bacon-locations
+    locationsFile = ".bacon-locations",
+    -- Maximum time in seconds the LSP server waits for Bacon to update the
+    -- export file before loading the new diagnostics
+    waitTimeSeconds = 10
+}
+```
+    ]],
+  },
+}