docs(solana): ADR: ICS27 GMP Architecture for Solana

[mariuszzak]

Description

ADR: ICS27 GMP Architecture for Solana

ref: IBCSOL-265

---

Before we can merge this PR, please make sure that all the following items have been
checked off. If any of the checklist items are not applicable, please leave them but
write a little note why.

• Linked to GitHub issue with discussion and accepted design, OR link to spec that describes this work.
• Wrote unit and integration tests.
• Added relevant natspec and godoc comments.
• Provide a conventional commit message to follow the repository standards.
• Re-reviewed Files changed in the GitHub PR explorer.
• Review SonarCloud Report in the comment section below once CI passes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (feat/solana@f0757c1). Learn more about missing BASE report.

Additional details and impacted files

@@              Coverage Diff               @@
##             feat/solana     #756   +/-   ##
==============================================
  Coverage               ?   99.86%           
==============================================
  Files                  ?       17           
  Lines                  ?      767           
  Branches               ?        0           
==============================================
  Hits                   ?      766           
  Misses                 ?        1           
  Partials               ?        0           

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[linear]

IBCSOL-265 Design ICS27-GMP application for Solana