Various TransactionType small optimizations

[fab-10]

PR description

I found that there was an unnecessary array created on every call to TransactionType::of so I decided to do a small PR to remove that allocation, since the method should be called many times, but then I also found a bunch of other small optimizations that ended up in this PR, where all the static values are pre-calculated and set at the beginning, to avoid set lookup and comparison.

In a micro benchmark the new version of TransactionType::of (renamed to TransactionType::fromOpaque is now 20x faster

Before

Benchmark                                  Mode  Cnt    Score   Error  Units
TransactionTypeBenchmark.ofSerializedType  avgt   15  120.077 ± 9.074  ns/op

After

Benchmark                                  Mode  Cnt  Score   Error  Units
TransactionTypeBenchmark.ofSerializedType  avgt   15  5.857 ± 0.266  ns/op

Fixed Issue(s)

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• Checked out our contribution guidelines?
• Considered documentation and added the doc-change-required label to this PR if updates are required.
• Considered the changelog and included an update if required.
• For database changes (e.g. KeyValueSegmentIdentifier) considered compatibility and performed forwards and backwards compatibility tests

Locally, you can run these tests to catch failures early:

• spotless: ./gradlew spotlessApply
• unit tests: ./gradlew build
• acceptance tests: ./gradlew acceptanceTest
• integration tests: ./gradlew integrationTest
• reference tests: ./gradlew ethereum:referenceTests:referenceTests
• hive tests: Engine or other RPCs modified?

[macfarla]

LGTM