Move lsp config to local file structure

.config/nvim/lsp/kotlin_language_server.lua

@@ -0,0 +1,42 @@
+---@brief
+---
+--- A kotlin language server which was developed for internal usage and
+--- released afterwards. Maintaining is not done by the original author,
+--- but by fwcd.
+---
+--- It is built via gradle and developed on github.
+--- Source and additional description:
+--- https://github.com/fwcd/kotlin-language-server
+---
+--- This server requires vim to be aware of the kotlin-filetype.
+--- You could refer for this capability to:
+--- https://github.com/udalov/kotlin-vim (recommended)
+--- Note that there is no LICENSE specified yet.
+---
+--- For faster startup, you can setup caching by specifying a storagePath
+--- in the init_options. The default is your home directory.
+
+--- The presence of one of these files indicates a project root directory
+--
+--  These are configuration files for the various build systems supported by
+--  Kotlin. I am not sure whether the language server supports Ant projects,
+--  but I'm keeping it here as well since Ant does support Kotlin.
+local root_files = {
+  'settings.gradle', -- Gradle (multi-project)
+  'settings.gradle.kts', -- Gradle (multi-project)
+  'build.xml', -- Ant
+  'pom.xml', -- Maven
+  'build.gradle', -- Gradle
+  'build.gradle.kts', -- Gradle
+}
+
+---@type vim.lsp.Config
+return {
+  filetypes = { 'kotlin' },
+  root_markers = root_files,
+  cmd = { 'kotlin-language-server' },
+  init_options = {
+    -- Enables caching and use project root to store cache data.
+    storagePath = vim.fs.root(vim.fn.expand '%:p:h', root_files) --[[@as string]],
+  },
+}