fix: make MultichainCore's dapp name and url properties mandatory

[wenfix]

Explanation

In order for a connect request to succeed on Metamask Mobile via MultichainCore, it needs to have a dapp.name and dapp.url properties configured as they're enforced in this mobile validation function. This PR marks them as mandatory.

References

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 communicated my changes to consumers by updating changelogs for packages I've changed, highlighting breaking changes as necessary
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes

[adonesky1]

LGTM