Indexer performance update: Add skip_metadata flag for token if indexer failed to get any of [name, symbol, decimals, totalSupply]

[vbaranov]

Motivation

Optimization of indexer performance: reducing the number of requests to the archive node.

Changelog

• Add skip_metadata flag to tokens table if indexer failed to fetch [name, symbol, decimals, totalSupply] props from the token from the archive node. And if the flag is set, then indexer will skip the request for these props next time.

• In token total supply on-demand fetcher replace requesting for the whole set of token functions ([name, symbol, decimals, totalSupply]) with totalSupply only request.

• [Chore] add bridged prop to the default_on_conflict function for tokens importer.

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