Jl/caip multichain/add eip155 reference regex

[jiexi]

Explanation

Fixes bug where 0 prefixed and e exponent suffixed eip155 references were allowed. This PR adds eip155 reference validation against regex.

I'm unsure if this belongs in validation checks, or the supported checks. Validation checks currently do not check for ecosystem specific constraints

References

Changelog

@metamask/package-a

• : Your change here
• : Your change here

@metamask/package-b

• : Your change here
• : Your change here

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've highlighted breaking changes using the "BREAKING" category above as appropriate
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes