Add flag isUsingBlockchainContext to ErgoTree

[megatron00999]

Fixes #928

Add a flag isUsingBlockchainContext to ErgoTree similar to the existing hasDeserialize.

[megatron00999]

@kushti @aslesarenko Please review and let me know if there is anything else I need to do in this PR. Thank you.

[aslesarenko]

@megatron00999, I targeted the next release branch, please resolve the conflicts.

[aslesarenko]

Please look how _hasDeserialize is initialized
var _hasDeserialize: Option[Boolean] = givenDeserialize
and were givenDeserialize comes from.

The key point is here where ErgoTree is created in the serializer with Some(...) value.
This way no additional traverse is necessary after deserialization, which is the main use case during tx validation and is critical for performance.

[megatron00999]

@aslesarenko Updated now. Added the detection of blockchain context during parsing in 44844ac

[aslesarenko]

LGTM, but please fix the tests

tests need to be fixed first, otherwise LGTM

[megatron00999]

Strangely, CalcSha256Specification test failed locally on my system with the following error:

[info] CalcSha256Specification:
[info] - CalcSha256: Should pass standard tests. *** FAILED ***
[info]   AssertionError was thrown during property evaluation. (CalcSha256Specification.scala:35)
[info]     Message: assertion failed: Inconsistent stack at List(sigmastate.eval.CProfiler$OpStat@64a05def, sigmastate.eval.CProfiler$OpStat@42d7f5a7, sigmastate.eval.CProfiler$OpStat@643956ec, sigmastate.eval.CProfiler$OpStat@1a3afd0f)
[info]     Occurred at table row 3 (zero based, not counting headings), which had values (
[info]       string = abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmnhijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu,
[info]       hash = cf5b16a778af8380036ce59e7b0492370b249b11e8f07a51afac45037afee9d1
[info]     )

When I reran, the test passed.

[megatron00999]

The tests should be fixed now with 0a2390d.

[kushti]

@megatron00999 please reach me over Discord or email [email protected] and provide ERG address (ordinary or stealth) to get the bounty paid

[megatron00999]

@kushti Thanks, sent you a message on Discord with the address.