adds address codec doc to 10.x and next

[Cordtus]

Description

Adds docs based on cosmos/evm 665 detailing the concept and implementation of an address codec (specifically for EVM wallet address support) to both 'next' and '10.x' sections.

closes: blocker on release

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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.

• [Y] Linked to GitHub issue with discussion and accepted design, OR link to spec that describes this work.
• Include changelog entry when appropriate (e.g. chores should be omitted from changelog).
• Wrote unit and integration tests if relevant.
• [Y] Updated documentation (docs/) if anything is changed.
• Added godoc comments if relevant.
• [Y] Self-reviewed Files changed in the GitHub PR explorer.
• Provide a conventional commit message to follow the repository standards.

wrong commit message prefix -- oops

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.31%. Comparing base (6a85e5c) to head (2e264d5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8662   +/-   ##
=======================================
  Coverage   58.31%   58.31%           
=======================================
  Files         319      319           
  Lines       22821    22821           
=======================================
  Hits        13307    13307           
  Misses       8907     8907           
  Partials      607      607           

Flag	Coverage Δ
08-wasm	65.99% <ø> (ø)
e2e	1.14% <ø> (ø)
ibc-go	63.74% <ø> (ø)

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