fix: remove source code fields from list endpoint

[zachdaniel]

Resolves #1894

Displaying full source code and decompiled source code in the contract endpoint results in massive payloads and a very slow endpoint. This updates the list endpoint to not show the source code and decompiled source code fields. In order to get those fields one has to use the getsourcecode action.

Changelog

Bug Fixes

• Fix performance issue of rendering source code + decompiled source code in the contract list endpoint

Incompatible Changes

• This is a new endpoint, so I don't think we need to worry too much about changes (especially since it was almost unusable up until now), but it is technically removing a field from an API endpoint, so something to consider.

  • 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 if necessary

[coveralls]

Pull Request Test Coverage Report for Build 1776bfd7-ca14-4949-a3f1-72bc1b7dbe83

• 15 of 18 (83.33%) changed or added relevant lines in 3 files are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.06%) to 81.829%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
apps/block_scout_web/lib/block_scout_web/controllers/api/rpc/contract_controller.ex	6	7	85.71%
apps/explorer/lib/explorer/chain.ex	0	2	0.0%

Files with Coverage Reduction	New Missed Lines	%
apps/block_scout_web/lib/block_scout_web/views/api/rpc/contract_view.ex	1	96.43%
apps/block_scout_web/lib/block_scout_web/controllers/api/rpc/contract_controller.ex	1	84.75%

Totals
Change from base Build 0164a398-f3d3-42fa-9434-4cfc67196199:	0.06%
Covered Lines:	4643
Relevant Lines:	5674

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💛 - Coveralls