refactor: treesitter utils (#91)

* refactor(ts_utils): i dont know why event it was here

* fix: typos

* fix(struct_tags)!: remove statement that i used for debug

* refactor(ts_util): start from scratch

* refactor(struct_tags): use new ts_util

* fixup! refactor(struct_tags): use new ts_util

* test(struct_tags): add support for multiple structs

* fix(gotests): use new api

* fix(impl): refactor some logic, use new api

* docs(ts): add an explanation

* refactor(_utils.ts): all public methods are just adapters

* fix(comment): now it works

* fixup! refactor(_utils.ts): all public methods are just adapters

* fixup! fixup! refactor(_utils.ts): all public methods are just adapters

* test(comment): e2e

* tests(comment): fix

* refactor(utils.ts): fix, docs

* test(comment): fix tests again

* fix(tests/comments): well, now i fell stupid

* refactor(ts): add assert just to be sure that all elements are in the result

* fix(ts): type annotations

* fix(ts): pass bufnr to vim.treesitter.get_node

* chore(ci): disable nightly

* chore(ci): reorganize

lua/gopher/gotests.lua

@@ -77,13 +77,10 @@ end
 
 -- generate unit test for one function
 function gotests.func_test()
-  local ns = ts_utils.get_func_method_node_at_pos(unpack(vim.api.nvim_win_get_cursor(0)))
-  if ns == nil or ns.name == nil then
-    u.notify("cursor on func/method and execute the command again", vim.log.levels.WARN)
-    return
-  end
+  local bufnr = vim.api.nvim_get_current_buf()
+  local func = ts_utils.get_func_under_cursor(bufnr)
 
-  add_test { "-only", ns.name }
+  add_test { "-only", func.name }
 end
 
 -- generate unit tests for all functions in current file