extend start mining-sv2-proxy to accept multiple upstreams

[Shourya742]

closes: #1575

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 19.31%. Comparing base (36c0d65) to head (3c88555).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1576      +/-   ##
==========================================
- Coverage   28.53%   19.31%   -9.23%     
==========================================
  Files          74      131      +57     
  Lines        5298     9298    +4000     
==========================================
+ Hits         1512     1796     +284     
- Misses       3786     7502    +3716     

Flag	Coverage Δ
binary_codec_sv2-coverage	0.00% <ø> (ø)
binary_sv2-coverage	8.59% <ø> (ø)
bip32_derivation-coverage	0.00% <ø> (ø)
buffer_sv2-coverage	37.68% <ø> (ø)
codec_sv2-coverage	0.03% <ø> (ø)
common_messages_sv2-coverage	0.21% <ø> (ø)
const_sv2-coverage	0.00% <ø> (ø)
error_handling-coverage	0.00% <ø> (ø)
framing_sv2-coverage	0.45% <ø> (ø)
jd_client-coverage	0.44% <ø> (?)
jd_server-coverage	14.50% <ø> (?)
job_declaration_sv2-coverage	0.00% <ø> (ø)
key-utils-coverage	3.61% <ø> (ø)
mining-coverage	3.86% <ø> (-0.03%)	⬇️
mining_device-coverage	0.00% <ø> (?)
mining_proxy_sv2-coverage	0.98% <ø> (?)
noise_sv2-coverage	7.30% <ø> (ø)
pool_sv2-coverage	2.68% <ø> (?)
protocols	27.15% <ø> (-0.03%)	⬇️
roles	7.12% <ø> (?)
roles_logic_sv2-coverage	13.57% <ø> (ø)
sv2_ffi-coverage	0.00% <ø> (ø)
template_distribution_sv2-coverage	0.00% <ø> (ø)
translator_sv2-coverage	10.18% <ø> (?)
utils	36.39% <ø> (ø)
v1-coverage	3.74% <ø> (ø)

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