Add flag for disabling xexchange prices

[bogdan-rosianu]

Reasoning

Proposed Changes

How to test

[github-actions]

k6 load testing comparison.
Base Commit Hash: 8e28b11
Target Commit Hash: ab1e425

Metric	Base				Target				Diff
	Avg	Max	90	95	Avg	Max	90	95	Avg	Max	90	95
Tokens	61.00	580.76	65.06	68.52	63.93	818.35	68.22	71.47	+4.81% 🔴	+40.91% 🔴	+4.86% 🔴	+4.30% 🔴
Accounts	62.04	1176.45	64.96	68.60	64.19	758.66	68.19	71.14	+3.46% 🔴	-35.51% ✅	+4.98% 🔴	+3.71% 🔴
Mex	60.37	613.96	65.02	68.47	63.03	965.17	68.24	71.41	+4.41% 🔴	+57.20% 🔴	+4.94% 🔴	+4.28% 🔴
Blocks	69.76	657.17	66.24	72.46	71.91	569.31	69.35	77.74	+3.09% 🔴	-13.37% ✅	+4.70% 🔴	+7.29% 🔴
Pool	60.41	228.77	65.02	68.53	63.71	505.09	68.28	71.56	+5.46% 🔴	+120.78% 🔴	+5.02% 🔴	+4.41% 🔴
Nodes	61.53	916.77	65.06	68.53	63.34	387.43	68.29	71.45	+2.95% 🔴	-57.74% ✅	+4.96% 🔴	+4.26% 🔴
Transactions	79.10	1599.27	66.26	71.34	82.42	1533.14	69.58	75.23	+4.21% 🔴	-4.13% ✅	+5.01% 🔴	+5.45% 🔴
Test Run Duration	60002.46				60005.93

Legend: Avg - Average Response Time, Max - Maximum Response Time, 90 - 90th Percentile, 95 - 95th Percentile
All times are in milliseconds.