feat: improve mock desmos app

[dadamu]

This PR intends to give a way to build custom DesmosKeeper for tests by having a new trait DesmosModule.

pub struct CustomDesmosKeeper {}
impl DesmosModule for CustomDesmosKeeper {
   // custom handle functions
}

#[test]
fn test_something() -> {
    let mut app = custom_desmos_app(CustomDesmosKeeper{}, |_, _, _| {});
    // test with custom mock app ...
}

After CosmWasm/cw-plus#773 is released, it can be merged.

[codecov]

Codecov Report

Base: 90.94% // Head: 91.10% // Increases project coverage by +0.15% 🎉

Coverage data is based on head (78bcf0a) compared to base (168ddc3).
Patch coverage: 97.14% of modified lines in pull request are covered.

❗ Current head 78bcf0a differs from pull request most recent head 347614f. Consider uploading reports for the commit 347614f to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #38      +/-   ##
==========================================
+ Coverage   90.94%   91.10%   +0.15%     
==========================================
  Files          27       27              
  Lines        2276     2350      +74     
==========================================
+ Hits         2070     2141      +71     
- Misses        206      209       +3     

Impacted Files	Coverage Δ
packages/bindings-test/src/chain_communication.rs	0.00% <0.00%> (ø)
packages/bindings/src/reactions/querier.rs	65.71% <ø> (ø)
packages/bindings/src/relationships/querier.rs	89.36% <ø> (ø)
packages/bindings/src/subspaces/mocks.rs	100.00% <ø> (ø)
packages/bindings/src/subspaces/querier.rs	91.70% <ø> (ø)
packages/bindings/src/profiles/querier.rs	92.12% <90.90%> (-0.22%)	⬇️
packages/bindings/src/posts/mocks.rs	99.00% <98.79%> (ø)
packages/bindings/src/mocks/mock_queriers.rs	98.14% <100.00%> (ø)
packages/bindings/src/posts/querier.rs	90.86% <100.00%> (+0.09%)	⬆️
packages/bindings/src/profiles/mocks.rs	100.00% <100.00%> (ø)
... and 6 more

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[dadamu]

This file shows the default desmos keeper migrated from mock_app.rs