upgrage exchain into v0.19.17 & add a new way to send evm tx

[banishee]

• 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

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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 #146 (2472921) into master (b1c15d6) will decrease coverage by 1.01%. The diff coverage is 5.88%.

@@            Coverage Diff             @@
##           master     #146      +/-   ##
==========================================
- Coverage   82.38%   81.36%   -1.02%     
==========================================
  Files          42       42              
  Lines        1277     1293      +16     
==========================================
  Hits         1052     1052              
- Misses        185      201      +16     
  Partials       40       40              

Impacted Files	Coverage Δ
module/auth/auth.go	100.00% <ø> (ø)
module/backend/backend.go	100.00% <ø> (ø)
module/dex/dex.go	100.00% <ø> (ø)
module/dex/tx.go	100.00% <ø> (ø)
module/distribution/distribution.go	100.00% <ø> (ø)
module/distribution/tx.go	100.00% <ø> (ø)
module/evm/evm.go	100.00% <ø> (ø)
module/evm/tx.go	38.46% <0.00%> (-5.40%)	:arrow_down:
module/evm/utils.go	89.47% <ø> (ø)
module/evm/web3_proxy.go	0.00% <ø> (ø)
... and 24 more

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