Add back deprecated traceStartBlock methods to the tracer API

[lu-pinto]

PR description

This PR adds back removed methods from the tracer API that are now marked as deprecated and will removed at a later point. This is to avoid breaking any other existing customers of the API.

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• Considered documentation and added the doc-change-required label to this PR if updates are required.
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• unit tests: ./gradlew build
• acceptance tests: ./gradlew acceptanceTest
• integration tests: ./gradlew integrationTest
• reference tests: ./gradlew ethereum:referenceTests:referenceTests