[Feature] CosmWasm cache update

[yun-yeo]

Summary of changes

The problem is described here CosmWasm/cosmwasm#603.

• Cherry-pick CosmWasm file & memory cache following updates
  Allow constructing CacheOptions crate externaly CosmWasm/cosmwasm#614
  Add in-memory cache for Modules CosmWasm/cosmwasm#607
  Replace wabt with wat, which is written in pure Rust CosmWasm/cosmwasm#606
  Improve FileSystemCache CosmWasm/cosmwasm#605
  Improve Wasm deserialize testing CosmWasm/cosmwasm#578

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 #426 (7257f0f) into develop (f2b6cd6) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #426      +/-   ##
===========================================
- Coverage    67.56%   67.51%   -0.06%     
===========================================
  Files          117      117              
  Lines         5053     5051       -2     
===========================================
- Hits          3414     3410       -4     
- Misses        1426     1427       +1     
- Partials       213      214       +1     

Impacted Files	Coverage Δ
x/oracle/tally.go	88.37% <0.00%> (-4.66%)	⬇️
x/auth/vesting/types/schedule.go	63.63% <0.00%> (-1.28%)	⬇️

[hanjukim]

Test passed with both columbus-4 and tequila