Compute hashes correctly when constructing internalised collections

[geo2a]

This PR fixes a bug in the computation of the synthesis bottom-up hash attribute of Terms representing internalised maps and sets. These hashes are used in the Eq instance for Term to quilcky check if two terms are equal, akin to a Merkle tree.

Summary of changes:

• the commits 348f852, 17005f2 and df6a063 comprise the main fix, i.e. correct how the KMap and KSet pattern-synonyms compute the hashes;
• b7aac44 makes sure we foldl' rather than foldr in some of the cases, as we should use the left fold for data as rule of thumb for better performance. I did not check the impact of this commit specifically though;
• there are some more stylistic changes and unit tests for the first change.

[ehildenb]

We must have a testing harness for this, and multiple tests! Ideally unit and integration!

[geo2a]

Yeah, I'm adding unit tests now.

[geo2a]

KEVM performance at commit b7aac44 with 3 workers. The numbers may be skewed and the code is still wrong anyway. I'm rerunning with 3d58ba3 and 1 worker.

Test	georgy-fix-collection-hashes time	master-bafee82 time	(georgy-fix-collection-hashes/master-bafee82) time
kontrol/test-emitcontracttest-testexpectemit-0-spec.k	53.79	116.85	0.4603337612323492
kontrol/test-storetest-testaccesses-0-spec.k	54.16	115.96	0.467057606071059
kontrol/test-emitcontracttest-testexpectemitcheckemitter-0-spec.k	52.53	71.11	0.7387146674166785
mcd/flipper-ttl-pass-spec.k	59.66	78.15	0.7634037108125399
kontrol/test-allowchangestest-testallow_fail-0-spec.k	55.79	66.72	0.8361810551558753
kontrol/test-expectreverttest-testfail_expectrevert_false-0-spec.k	81.23	96.83	0.8388929050913974
erc20/hkg/transferFrom-success-1-spec.k	66.82	77.02	0.867566865749156
mcd/vat-slip-pass-rough-spec.k	121.16	126.05	0.9612058706862356
kontrol/test-arithmetictest-test_max1_broken-uint256-uint256-0-spec.k	51.62	49.78	1.036962635596625
mcd/vat-addui-fail-rough-spec.k	85.58	81.8	1.0462102689486552
erc20/ds/transferFrom-failure-1-a-spec.k	93.67	89.46	1.0470601386094345
mcd/vat-subui-fail-rough-spec.k	95.21	89.88	1.059301290609702
erc20/hkg/transferFrom-success-2-spec.k	77.34	66.35	1.165636774679729
kontrol/test-allowchangestest-testfailallowcallstoaddress-0-spec.k	70.87	57.4	1.2346689895470384
kontrol/test-expectcalltest-testexpectstaticcall-0-spec.k	71.36	52.58	1.3571700266260935
kontrol/test-expectcalltest-testexpectregularcall-0-spec.k	117.04	51.96	2.252501924557352
TOTAL	1207.83	1287.9	0.9378290239925459

[geo2a]

KEVM performance at commit https://github.com/runtimeverification/hs-backend-booster/commit/3d58ba36c7870f9156f4cd2964f58add73c8133b with 1 worker

Test	georgy-fix-collection-hashes time	master-bafee82 time	(georgy-fix-collection-hashes/master-bafee82) time
mcd/flopper-file-pass-rough-spec.k	439.37	463.1	0.9487583675232131
erc20/hkg/transferFrom-success-1-spec.k	64.09	66.82	0.9591439688715955
erc20/ds/transferFrom-failure-2-c-spec.k	57.93	55.79	1.038358128696899
erc20/ds/transferFrom-success-1-spec.k	98.77	94.32	1.0471798134011874
TOTAL	660.16	680.03	0.970780700851433