feat: add support for sourcery

lua/lspconfig/server_configurations/sourcery.lua

@@ -0,0 +1,49 @@
+local util = require 'lspconfig/util'
+
+local root_files = {
+  'pyproject.toml',
+  'setup.py',
+  'setup.cfg',
+  'requirements.txt',
+  'Pipfile',
+  'pyrightconfig.json',
+}
+
+return {
+  default_config = {
+    cmd = { 'sourcery', 'lsp' },
+    filetypes = { 'python' },
+    init_options = {
+      editor_version = 'vim',
+      extension_version = 'vim.lsp',
+      token = '<YOUR_TOKEN>',
+    },
+    root_dir = function(fname)
+      return util.root_pattern(unpack(root_files))(fname) or util.find_git_ancestor(fname)
+    end,
+    single_file_support = true,
+  },
+  docs = {
+    description = [[
+https://github.com/sourcery-ai/sourcery
+
+Refactor Python instantly using the power of AI.
+
+It requires the initializationOptions param to be populated as shown below and will respond with the list of ServerCapabilities that it supports.
+
+init_options = {
+    --- The Sourcery token for authenticating the user.
+    --- This is retrieved from the Sourcery website and must be
+    --- provided by each user. The extension must provide a
+    --- configuration option for the user to provide this value.
+    token = <YOUR_TOKEN>
+
+    --- The extension's name and version as defined by the extension.
+    extension_version = 'vim.lsp'
+
+    --- The editor's name and version as defined by the editor.
+    editor_version = 'vim'
+}
+]],
+  },
+}