Add CORS headers to API.Server #3692

Job	Run time
Build & test (plutus-cbor)	1m 33s
Build haddock using nix	6m 9s
Build & test (plutus-merkle-tree)	1m 32s
Build & test (hydra-plutus)	1m 24s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	5m 12s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	4m 22s
Build specification using nix	1m 12s
Build & test (hydra-tui)	5m 52s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	8m 11s
Build & test (hydra-node)	7m 15s
Benchmarks (plutus-merkle-tree, on-chain-cost, $(pwd)/../benchmarks)	1m 41s
Build & test (hydra-cluster)	11m 52s
Publish benchmark results	4s
Publish test results	12s
Documentation	1m 26s
	57m 57s

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