BCI-2376 TXM as service. Post TX endpoint.

[dhaidashenko]

Marking it as draft while we are waiting for sec review

• Added new endpoint that allows users to submit transaction request to TXM. Primary use case for this endpoint is config distribution via Gauntlet++
• Endpoint requires Admin Role. Additionally it must be enabled via feature flag.

Open questions:

• Is this tx.FeeLimit = chain.Config().EVM().GasEstimator().LimitDefault() the right way to get FeeLimit?

Issues that are not solved by this PR

• It's not possible to deploy contract using this endpoint as Txm by design does not allow to set nil toAddress
• Confirmed transactions are removed from db at some point. Gauntlet++ expects idempotent behavior of the endpoint on provided key. We might endup with duplicated transactions that might lead to unforeseen issues.
• GET /transactions/evm returns last TxAttempt which might not be the one that is actually included into the chain

[github-actions[bot]]

I see that you haven't updated any README files. Would it make sense to do so?

[cl-sonarqube-production[bot]]

SonarQube Quality Gate

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

92.2% Coverage
0.0% Duplication

[github-actions[bot]]

This PR is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 7 days.

[github-actions[bot]]

This PR is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 7 days.