fix: app links not being verified successfully

[RiccardoM]

Description

This PR fixes the applications links from not being verified correctly
Closes: #661

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• confirmed the correct type prefix in the PR title
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[RiccardoM]

To allow to sign arbitrary data, we simply require the oracle to return the signature, the signed value and the username as well

[codecov]

Codecov Report

Merging #662 (8eca2c3) into master (1a22342) will decrease coverage by 68.45%.
The diff coverage is 73.57%.

@@             Coverage Diff             @@
##           master     #662       +/-   ##
===========================================
- Coverage   84.23%   15.78%   -68.46%     
===========================================
  Files          91      169       +78     
  Lines        6624    45994    +39370     
===========================================
+ Hits         5580     7262     +1682     
- Misses        833    38109    +37276     
- Partials      211      623      +412     

Impacted Files	Coverage Δ
x/profiles/client/cli/cli_app_links.go	34.16% <ø> (ø)
x/profiles/client/cli/cli_params.go	70.00% <ø> (ø)
x/profiles/client/cli/cli_relationships.go	75.51% <ø> (ø)
x/profiles/client/cli/query.go	0.00% <ø> (ø)
x/profiles/client/cli/tx.go	0.00% <ø> (ø)
x/profiles/client/utils/cli.pb.go	3.12% <ø> (ø)
x/profiles/client/utils/utils.go	56.25% <ø> (ø)
x/profiles/keeper/alias_functions.go	90.47% <ø> (ø)
x/profiles/keeper/genesis.go	84.61% <ø> (ø)
x/profiles/keeper/grpc_query.go	73.78% <ø> (ø)
... and 196 more

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