feat(core)!: add contract index to blockchain database #4184
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Description
feat: add contract index to blockchain database
feat: add fetch_contract_outputs_by_contract_id_and_type
feat: impl Display for FixedHash
feat: impl Display for OutputType
feat: add is_sidechain_contract fn to OutputFeatures
test: improvements to blockchain test helpers
test: add contract index tests
Motivation and Context
The contract index keeps track of contract UTXOs in the current UTXO set.
This index allows UTXOs related to contracts to be efficiently fetched and enforces data integrity rules (e.g. only one contract definition is allowed, contract constitution cannot be created without a definition etc.)
How Has This Been Tested?
A number of new blockchain database unit tests.
Manually, adding definition and constitution UTXOs to blockchain