feat: option to modify estimated fees in /v2/fees/transaction proxy #2628

Job	Run time
lint	1m 6s
test (api)	10m 18s
test-2_5 (block-zero-handling)	1m 26s
test (bns)	3m 16s
test-2_5 (faucet-stx)	1m 28s
test (bns-e2e)	7m 10s
test-rosetta (rosetta)	3m 21s
test-2_5 (pox-4-btc-address-formats)	2m 16s
test (btc-faucet)	1m 33s
test-rosetta (rosetta-construction)	2m 24s
test-2_5 (pox-4-delegate-aggregation)	2m 9s
test (event-replay)	2m 7s
test-rosetta (rosetta-cli-data)	2m 22s
test-2_5 (pox-4-delegate-stacking)	1m 47s
test (rpc)	1m 43s
test-rosetta (rosetta-cli-construction)	2m 32s
test-2_5 (pox-4-delegate-revoked-stacking)	1m 58s
test-2_5 (pox-4-stack-extend-increase)	2m 14s
test-2_5 (pox-4-rosetta-btc-addr-types)	5m 7s
test-2_5 (pox-4-rosetta-cycle-phases)	1m 19s
test-2_5 (pox-4-rosetta-segwit)	1m 39s
test-2_5 (pox-4-burnchain-stack-stx)	1m 34s
test-2_5 (pox-4-burnchain-delegate-stx)	1m 41s
build-publish	2m 0s
	1h 4m 30s

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