Contract interaction: an easy setting of precision for integer input

[vbaranov]

Motivation

Simplifying of procedure of adding trailing zeroes to (unsigned) integer input type.

Changelog

Checklist for your Pull Request (PR)

• I added an entry to CHANGELOG.md with this PR
• If I added new functionality, I added tests covering it.
• If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
• I checked whether I should update the docs and did so by submitting a PR to https://github.com/blockscout/docs
• If I added/changed/removed ENV var, I submitted a PR to https://github.com/blockscout/docs to update the list of env vars at https://github.com/blockscout/docs/blob/master/for-developers/information-and-settings/env-variables.md and I updated the version to master in the Version column. Changes will be reflected in this table: https://docs.blockscout.com/for-developers/information-and-settings/env-variables.
• If I add new indices into DB, I checked, that they are not redundant with PGHero or other tools

[coveralls]

Pull Request Test Coverage Report for Build 1c9c407d957c5d75ecec354e9184587c86a53233-PR-3532

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 17 unchanged lines in 5 files lost coverage.
• Overall coverage increased (+3.06%) to 66.495%

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Files with Coverage Reduction	New Missed Lines	%
test/block_scout_web/features/pages/chain_page.ex	1	90.0%
lib/block_scout_web/channels/address_channel.ex	2	36.96%
lib/block_scout_web/notifier.ex	2	81.82%
lib/block_scout_web/checksum_address.ex	6	55.56%
lib/block_scout_web/views/smart_contract_view.ex	6	73.91%

Totals
Change from base Build f41e898c3eab3ac7aab518740054d4a29d34f137:	3.06%
Covered Lines:	2064
Relevant Lines:	3104

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💛 - Coveralls