Move precompile-utils into frontier (#2181)

[rimbi]

• Moves the following crates to frontier repo:
  • precompile-utils
  • precompile-utils-macro
  • precompile-utils-tests-external
• Extracts the XCM related part of the precompile-utils into a separate crate called precompile-utils-xcm-codec and leaves it in moonbeam.

Here is the complementary PR: https://github.com/moonbeam-foundation/moonbeam/pull/2427