feat(comment): add support for: interface methods, struct fields, variables (#123)

* refactor(comment): dont use unnecessary function

* chore: quick way to open vim in dev mode

* feat(comment): add comment on on interface method

* feat(comment): add comment on a struct field

* feat(comment): add comment on a variable

* docs: add note about the generate function

* docs: gopher.TsResult

* fix(utils): handle case when indentation is wrong

spec/fixtures/comment/many_structs_fields_input.go

@@ -0,0 +1,18 @@
+package main
+
+type (
+	TestOne struct {
+		Asdf string
+		ID   int
+	}
+
+	TestTwo struct {
+		Fesa int
+		A    bool
+	}
+
+	TestThree struct {
+		Asufj int
+		Fs    string
+	}
+)