Add tx-cost-diff executable #6046

Job	Run time
Build haddock using nix	1m 11s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	1m 57s
Build specification using nix	1m 27s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	1m 33s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	3m 59s
Build & test (plutus-cbor)	1m 13s
nix flake check	4m 47s
Benchmarks (plutus-merkle-tree, on-chain-cost, $(pwd)/../benchmarks)	1m 15s
Build & test (plutus-merkle-tree)	1m 4s
Build & test (hydra-plutus)	1m 30s
Build & test (hydra-tui)	3m 15s
Compute cost differences	4m 51s
Build & test (hydra-node)	4m 43s
Build & test (hydra-tx)	1m 47s
Build & test (hydra-cluster)	4m 47s
Publish benchmark results	4s
Publish test results	1s
Documentation	1s
	39m 25s

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