Add ERC-20 option for embedding ERC-7786 based crosschain bridge

[ericglau]

• Adds an "Embedded" option under ERC-20 Cross-chain bridging to use ERC20Crosschain.
• "Custom" and "Embedded" options now require access control.
  • "Custom" (ERC20Bridgeable) now allows privileged roles to set the token bridge address after deployment (this is a breaking change). This is needed so that tokens can later update their bridge address to use a BridgeERC7802 if desired.
  • "Embedded" (ERC20Crosschain) allows privileged roles to update links.

To do:

• Update to use openzeppelin-contracts master when ERC-7786 based crosschain bridge for ERC-20 tokens openzeppelin-contracts#5914 is merged.
• Update to use next release of openzeppelin-contracts when available, revert temporary remappings from using master
• Add changeset, note breaking changes requiring access control

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[socket-security]

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