node with no blockchain as provider

[Guillembonet]

Node now has fallback services to provide the info required to serve traffic without blockchain.

Signed-off-by: Guillem Bonet guillem@mysterium.network

[codecov-commenter]

Codecov Report

Merging #5058 (587fd9a) into master (1dc3a85) will decrease coverage by 0.07%.
The diff coverage is 32.53%.

@@            Coverage Diff             @@
##           master    #5058      +/-   ##
==========================================
- Coverage   39.36%   39.28%   -0.08%     
==========================================
  Files         359      360       +1     
  Lines       19189    19273      +84     
==========================================
+ Hits         7553     7572      +19     
- Misses      10907    10965      +58     
- Partials      729      736       +7     

Impacted Files	Coverage Δ
session/pingpong/factory.go	0.00% <0.00%> (ø)
session/pingpong/hermes_url_getter.go	0.00% <0.00%> (ø)
session/pingpong/hermes_status_checker.go	72.58% <16.66%> (-12.04%)	⬇️
session/pingpong/invoice_tracker.go	63.58% <25.00%> (-0.62%)	⬇️
observer/api.go	49.12% <56.09%> (ø)
tequilapi/endpoints/sse_handler.go	70.00% <0.00%> (-3.58%)	⬇️
nat/traversal/pinger.go	76.35% <0.00%> (-3.49%)	⬇️
session/pingpong/consumer_balance_tracker.go	57.34% <0.00%> (-0.72%)	⬇️
p2p/channel.go	67.50% <0.00%> (+1.44%)	⬆️
... and 1 more

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