WIP: Add Unsafe constructors for TxBody, TxBodyRaw and MemoBytes

[sgillespie]

This will enable replaying the ledger state with less memory for applications that only use staking/governance/events. Specifically, they can trim unnecessary information from blocks before applying them to the ledger state

Description

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• New tests are added if needed and existing tests are updated
• All visible changes are prepended to the latest section of a CHANGELOG.md for the affected packages.
  New section is never added with the code changes. (See RELEASING.md)
• When applicable, versions are updated in .cabal and CHANGELOG.md files according to the
  versioning process.
• The version bounds in .cabal files for all affected packages are updated.
  If you change the bounds in a cabal file, that package itself must have a version increase. (See RELEASING.md)
• Code is formatted with fourmolu (use scripts/fourmolize.sh)
• Cabal files are formatted (use scripts/cabal-format.sh)
• hie.yaml has been updated (use scripts/gen-hie.sh)
• Self-reviewed the diff

[lehins]

This extra indirection is totally unnecessary

Suggested change

	AlonzoTxBodyRaw (
	UnsafeAlonzoTxBodyRaw,
	uatbInputs,
	uatbCollateral,
	uatbOutputs,
	uatbCerts,
	uatbWithdrawals,
	uatbTxFee,
	uatbValidityInterval,
	uatbUpdate,
	uatbReqSignerHashes,
	uatbMint,
	uatbScriptIntegrityHash,
	uatbAuxDataHash,
	uatbTxNetworkId
	),
	AlonzoTxBodyRaw (..)