feat: Shield: log transaction and signature

[matthiasgeihs]

Explanation

Context: ShieldController

Once a transaction is submitted or a signature request is fulfilled, the transaction hash or signature, respectively, are logged on the backend.

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

[lwin-kyaw]

Just wanna verify, this might change when we wanna do log on the confirmation reject, right?

[lwin-kyaw]

I understand the log logic will probably change after the discussion today.
But as of now, logging should be done only when the coverage result is available?

[lwin-kyaw]

I understand the log logic will probably change after the discussion today.
But as of now, logging should be done only when the coverage result is available?

[lwin-kyaw]

Same here, https://github.com/MetaMask/core/pull/6633/files#r2355709221