feat: support Ledger while signing values

[RiccardoM]

Description

This PR adds the Ledger support inside the sign command by wrapping the value into a transaction memo before signing it.

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Author Checklist

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• included the necessary unit and integration tests
• added a changelog entry to CHANGELOG.md
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• confirmed the correct type prefix in the PR title
• confirmed ! in the type prefix if API or client breaking change
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• reviewed state machine logic
• reviewed API design and naming
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[codecov]

Codecov Report

Base: 80.40% // Head: 80.24% // Decreases project coverage by -0.15% ⚠️

Coverage data is based on head (45e6d46) compared to base (073b6ce).
Patch coverage: 44.44% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1059      +/-   ##
==========================================
- Coverage   80.40%   80.24%   -0.16%     
==========================================
  Files         176      176              
  Lines       15390    15444      +54     
==========================================
+ Hits        12374    12393      +19     
- Misses       2476     2509      +33     
- Partials      540      542       +2     

Impacted Files	Coverage Δ
x/profiles/keeper/keeper.go	91.72% <ø> (ø)
x/profiles/keeper/relay_app_links.go	86.88% <ø> (ø)
x/profiles/keeper/relay_chain_links.go	86.36% <ø> (ø)
x/profiles/legacy/v4/store.go	61.53% <ø> (ø)
x/profiles/types/models_chain_links.go	74.28% <ø> (ø)
x/profiles/types/models_packets.go	94.28% <ø> (ø)
x/profiles/types/msgs_app_links.go	87.32% <ø> (ø)
x/relationships/legacy/v1/store.go	57.14% <ø> (ø)
app/desmos/cmd/sign/sign.go	47.91% <43.54%> (-16.37%)	⬇️
app/desmos/cmd/chainlink/create_json.go	57.14% <100.00%> (ø)

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[dadamu]

LGTM