store: Remove Amino

[alexanderbez]

Description

Remove Amino usage from the store pkg and sub-pkgs:

• Define new Pairs Proto schema
• Update IAVL proof value to be a Proto-encoded Pairs
• Update simulations and store to use new Pairs
• Move store/rootmulti/internal pkg to store root

---

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.

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer
• Review Codecov Report in the comment section below once CI passes

[codecov]

Codecov Report

Merging #6984 into master will decrease coverage by 0.08%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master    #6984      +/-   ##
==========================================
- Coverage   61.94%   61.86%   -0.09%     
==========================================
  Files         519      520       +1     
  Lines       32089    32108      +19     
==========================================
- Hits        19879    19865      -14     
- Misses      10596    10628      +32     
- Partials     1614     1615       +1     

[aaronc]

I'd rather this not be a top-level cosmos package. Isn't this really something internal to the SDK that clients or even people trying to re-implement the SDK in say rust would never use? We should have something like cosmos_sdk.internal for stuff like this. Or am I wrong and is this an essential part of consensus state and the app hash?

[amaury1093]

Note that after #6905, we'll have a cosmos.base parent, so this can go as cosmos.base.store.v1beta1?

[alexanderbez]

Yes @aaronc, it's used to compute the AppHash. I don't really care where this goes. If you have a preference on location, just let me know and I'll move it.

[aaronc]

Let's put it where @amaurymartiny suggested

[alexanderbez]

ACK

[amaury1093]

Happy to merge this, I'll take care of #6984 (comment) in #6905