feat: add support for eth_getBlockReceipts

[thomas-nguy]

Closes: #621

Description

Backport from release/v1.4.x-2

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For contributor use:

• 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

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For admin use:

• Added appropriate labels to PR (ex. WIP, R4R, docs, etc)
• Reviewers assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Attention: Patch coverage is 52.27273% with 21 lines in your changes missing coverage. Please review.

Project coverage is 46.13%. Comparing base (fac790e) to head (50e6160).
Report is 23 commits behind head on develop.

Files with missing lines	Patch %	Lines
rpc/backend/blocks.go	60.60%	9 Missing and 4 partials ⚠️
rpc/backend/tx_info.go	42.85%	3 Missing and 1 partial ⚠️
rpc/namespaces/ethereum/eth/api.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #638      +/-   ##
===========================================
- Coverage    46.14%   46.13%   -0.01%     
===========================================
  Files          181      181              
  Lines        18183    18217      +34     
===========================================
+ Hits          8390     8405      +15     
- Misses        9073     9087      +14     
- Partials       720      725       +5     

Files with missing lines	Coverage Δ
rpc/backend/backend.go	78.94% <ø> (ø)
rpc/backend/tx_info.go	58.14% <42.85%> (+0.11%)	⬆️
rpc/namespaces/ethereum/eth/api.go	0.00% <0.00%> (ø)
rpc/backend/blocks.go	76.44% <60.60%> (-2.32%)	⬇️

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