feat: add support for eth_getBlockReceipts

[thomas-nguy]

Closes: #621

TODO: add test on Cronos

Description

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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 46.14%. Comparing base (434f46d) to head (e29673e).
Report is 1 commits behind head on release/v1.4.x-2.

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                  @@
##           release/v1.4.x-2     #629      +/-   ##
====================================================
- Coverage             46.15%   46.14%   -0.01%     
====================================================
  Files                   181      181              
  Lines                 18182    18216      +34     
====================================================
+ Hits                   8391     8406      +15     
- Misses                 9071     9085      +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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