Allow to set user configuration via CLI, mobile and TequilAPI client.

[soffokl]

Closes: #3241
Required for: #3504 and #3506

[codecov-commenter]

Codecov Report

Merging #3928 (5e2466f) into master (b6cf13a) will decrease coverage by 0.23%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #3928      +/-   ##
==========================================
- Coverage   43.46%   43.23%   -0.24%     
==========================================
  Files         320      320              
  Lines       16858    16885      +27     
==========================================
- Hits         7328     7300      -28     
- Misses       8781     8834      +53     
- Partials      749      751       +2     

Impacted Files	Coverage Δ
cmd/commands/config/command.go	20.00% <0.00%> (-4.45%)	⬇️
mobile/mysterium/config.go	0.00% <0.00%> (ø)
mobile/mysterium/entrypoint.go	0.00% <0.00%> (ø)
tequilapi/client/client.go	3.17% <0.00%> (-0.09%)	⬇️
core/policy/oracle.go	83.78% <0.00%> (-8.11%)	⬇️
requests/dialer_swarm.go	73.28% <0.00%> (-5.35%)	⬇️
tequilapi/endpoints/sse_handler.go	69.34% <0.00%> (-3.65%)	⬇️
p2p/channel.go	72.72% <0.00%> (-2.19%)	⬇️
nat/traversal/pinger.go	76.19% <0.00%> (-1.91%)	⬇️

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