Websocket subscriptions improvements

[stefangutica]

Reasoning

Proposed Changes

How to test

[github-actions]

k6 load testing comparison.
Base Commit Hash: b40c3c4
Target Commit Hash: a9b9b63

Metric	Base				Target				Diff
	Avg	Max	90	95	Avg	Max	90	95	Avg	Max	90	95
Mex	45.82	734.47	59.70	62.14	38.79	1022.36	53.59	61.68	-15.35% ✅	+39.20% 🔴	-10.23% ✅	-0.74% ✅
Tokens	46.07	878.41	59.69	62.15	38.81	882.69	53.48	61.58	-15.77% ✅	+0.49% 🔴	-10.40% ✅	-0.92% ✅
Blocks	56.65	1013.65	62.62	70.42	49.20	1091.29	59.74	72.85	-13.15% ✅	+7.66% 🔴	-4.59% ✅	+3.45% 🔴
Nodes	45.51	474.54	59.64	62.06	60.18	21569.41	52.32	56.78	+32.25% 🔴	+4445.31% 🔴	-12.28% ✅	-8.52% ✅
Pool	45.88	745.52	59.60	62.00	38.84	856.39	53.55	61.42	-15.34% ✅	+14.87% 🔴	-10.14% ✅	-0.94% ✅
Accounts	47.99	803.92	61.52	67.05	41.41	1106.00	56.75	71.46	-13.73% ✅	+37.58% 🔴	-7.75% ✅	+6.58% 🔴
Transactions	53.02	656.50	62.72	81.64	64.16	17205.46	61.92	80.71	+21.00% 🔴	+2520.78% 🔴	-1.27% ✅	-1.14% ✅
Test Run Duration	60002.08				60002.43

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