Feat: P2P Attestation

[TheMarstonConnell]

Storage proofs can be handled completely off-chain by creating an attestation system.

[codecov]

Codecov Report

Merging #335 (cb721d2) into master (8c06429) will decrease coverage by 0.32%.
The diff coverage is 41.03%.

@@            Coverage Diff             @@
##           master     #335      +/-   ##
==========================================
- Coverage   47.62%   47.30%   -0.32%     
==========================================
  Files         231      237       +6     
  Lines        8139     8644     +505     
==========================================
+ Hits         3876     4089     +213     
- Misses       4016     4300     +284     
- Partials      247      255       +8     

Impacted Files	Coverage Δ
x/storage/keeper/grpc_query_providers.go	17.39% <0.00%> (-5.47%)	⬇️
x/storage/keeper/migrations.go	0.00% <0.00%> (ø)
x/storage/types/key_providers.go	25.00% <0.00%> (-75.00%)	⬇️
x/storage/types/keys.go	0.00% <ø> (ø)
x/storage/types/message_attest.go	0.00% <0.00%> (ø)
x/storage/types/message_shutdown_miner.go	0.00% <0.00%> (ø)
x/storage/types/params.go	12.14% <7.14%> (-2.15%)	⬇️
x/storage/keeper/collateral.go	17.64% <17.64%> (ø)
x/storage/keeper/grpc_query_attestation.go	22.85% <22.85%> (ø)
x/storage/keeper/msg_server_init_provider.go	47.61% <29.78%> (-52.39%)	⬇️
... and 7 more

[dahn510]

This looks awesome! Thank you!