Fix memory leak and module drop order

[yun-yeo]

Summary of changes

close #683

This PR is picking custom wasmer and cosmwasm and wasmvm to fix following problems:

• memory leak
• prev.start > max assertion, which is commonly known as poison error
  • change host_state drop order for InstanceHandle wasmerio/wasmer#2812
  • Fix drop order for Module fields wasmerio/wasmer#2806

Report of required housekeeping

• Github issue OR spec proposal link
• Wrote tests
• Updated API documentation (client/lcd/swagger-ui/swagger.yaml)
• Added a relevant changelog entry: clog add [section] [stanza] [message]

---

(FOR ADMIN) Before merging

• Added appropriate labels to PR
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)
• Confirm added tests are consistent with the intended behavior of changes
• Ensure all tests pass

[codecov]

Codecov Report

Merging #690 (8c48fee) into main (a6b93b7) will not change coverage.
The diff coverage is n/a.

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  Coverage   45.46%   45.46%           
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  Files         121      121           
  Lines        7063     7063           
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  Hits         3211     3211           
  Misses       3605     3605           
  Partials      247      247           

[yun-yeo]

wasmer finally released 2.2.1 and cosmwasm is now 0.16.6

It contains all the fixes we needed (drop order fix); therefore vanilla cosmwasm 0.16.6 is usable without any modifications.

We believe drop order fix fixed mem leak too.
Our infra nodes are running 0.16.6 already (to be released soon) and is stable without any sign of memleak

tho wasmer 2.2.1 changed its cache module format, and cosmwasm is forced to rebuild all cache upon request (either execute/query).

^ this can eat up resources under heavy concurrency; We wrote a script to rebuild module cache from .wasm blobs to the new format — https://github.com/kjessec/wasm-cache-rebuilder

[Vritra4]

lgtm