all: add benchmarks to core components

[cuonglm]

Description

Add benchmarks to core components, so we can do continuous benchmarking using Orijtech bencher.

Fixes #480

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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)

[cuonglm]

cc @odeke-em

[odeke-em]

LGTM, thank you @cuonglm!

[orijbot]

Visit https://dashboard.github.orijtech.com?back=0&pr=493&remote=false&repo=tharsis%2Fethermint to see benchmark details.