feat!: drop modules, general refactor and cleanup

runtime/queries/gomod/highlights.scm

@@ -0,0 +1,34 @@
+[
+  "require"
+  "replace"
+  "go"
+  "toolchain"
+  "exclude"
+  "retract"
+  "module"
+] @keyword
+
+"=>" @operator
+
+(comment) @comment @spell
+
+(module_path) @string.special.url
+
+(tool_directive) @keyword.directive
+
+(tool) @string.special.url
+
+[
+  (version)
+  (go_version)
+  (toolchain_name)
+] @string.special
+
+[
+  "("
+  ")"
+  "["
+  "]"
+] @punctuation.bracket
+
+"," @punctuation.delimiter

runtime/queries/gomod/injections.scm

@@ -0,0 +1,2 @@
+((comment) @injection.content
+  (#set! injection.language "comment"))