*: move most of the packages to 'pkg' (#47123)

ref #41241

Author: bb7133

.github/licenserc.yml

@@ -36,10 +36,10 @@ header:
     - "**/go.sum"
     - "LICENSE"
     - ".github/"
-    - "parser/"
+    - "pkg/parser/"
     - "dumpling/"
-    - "tidb-binlog/driver/example"
-    - "tidb-binlog/proto/go-binlog/secondary_binlog.pb.go"
+    - "pkg/tidb-binlog/driver/example"
+    - "pkg/tidb-binlog/proto/go-binlog/secondary_binlog.pb.go"
     - "**/*.sql"
     - "**/*.csv"
     - "**/*.parquet"
@@ -48,6 +48,6 @@ header:
     - "build/image/.ci_bazel"
     - "**/OWNERS"
     - "OWNERS_ALIASES"
-    - "disttask/**/mock/**/*_mock.go"
-    - "util/sqlexec/mock/*_mock.go"
+    - "pkg/disttask/**/mock/**/*_mock.go"
+    - "pkg/util/sqlexec/mock/*_mock.go"
   comment: on-failure

.gitmodules

@@ -1,3 +1,3 @@
 [submodule "extension/enterprise"]
-	path = extension/enterprise
+	path = pkg/extension/enterprise
 	url = git@github.com:pingcap-inc/enterprise-extensions.git