optimize LoadBlockMeta & LoadBlock

[cwbhhjl]

• 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.

• [ ] Wrote tests

• [ ] Updated relevant documentation (docs/)

• [ ] Added a relevant changelog entry to the Unreleased section in CHANGELOG.md

• [ ] Reviewed Files changed in the github PR explorer

---

For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge PR #XYZ: [title]" (coding standards)

[codecov-commenter]

Codecov Report

Merging #2291 (1c5ca00) into dev (178573b) will decrease coverage by 0.02%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##              dev    #2291      +/-   ##
==========================================
- Coverage   34.41%   34.39%   -0.03%     
==========================================
  Files         343      343              
  Lines       39237    39256      +19     
==========================================
- Hits        13503    13501       -2     
- Misses      24720    24740      +20     
- Partials     1014     1015       +1     

Impacted Files	Coverage Δ
app/rpc/backend/backend.go	0.00% <0.00%> (ø)
app/rpc/namespaces/eth/api.go	0.00% <0.00%> (ø)
app/rpc/namespaces/eth/api_multi.go	0.00% <0.00%> (ø)
x/wasm/keeper/keeper.go	84.62% <0.00%> (-0.34%)	:arrow_down:

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