plugins/nvim-jdtls: rename to jdtls, migrate to mkNeovimPlugin

plugins/by-name/jdtls/settings-options.nix

@@ -0,0 +1,46 @@
+lib:
+let
+  inherit (lib) types;
+  inherit (lib.nixvim) defaultNullOpts mkNullOrOption mkNullOrOption';
+in
+{
+  cmd = mkNullOrOption' {
+    type = with types; listOf str;
+    example = [
+      "java"
+      "-data"
+      "/path/to/your/workspace"
+      "-configuration"
+      "/path/to/your/configuration"
+      "-foo"
+      "bar"
+    ];
+    description = ''
+      The command that starts the language server.
+    '';
+  };
+
+  root_dir =
+    defaultNullOpts.mkStr { __raw = "require('jdtls.setup').find_root({'.git', 'mvnw', 'gradlew'})"; }
+      ''
+        Function to identify the root directory from which to run the language server.
+      '';
+
+  settings = mkNullOrOption (with types; attrsOf anything) ''
+    Here you can configure `eclipse.jdt.ls` specific settings.
+
+    See https://github.com/eclipse/eclipse.jdt.ls/wiki/Running-the-JAVA-LS-server-from-the-command-line#initialize-request
+    for a list of options.
+  '';
+
+  init_options = mkNullOrOption types.attrs ''
+    Language server `initializationOptions`.
+
+    You need to extend the `bundles` with paths to jar files if you want to use additional
+    `eclipse.jdt.ls` plugins.
+
+    See https://github.com/mfussenegger/nvim-jdtls#java-debug-installation
+
+    If you don't plan on using the debugger or other `eclipse.jdt.ls` plugins, ignore this option
+  '';
+}