Set poll options on token fetcher.

[rkachowski]

Description

Sets a poll config on the token fetcher to periodically stream uncataloged tokens from the database for reindexing. This is similar to how the internal transaction fetcher retrieves a list of unprocessed blocks to fetch transactions for.

Tested

• Deployed to staging and changed some token values
  • Set name and symbol to placeholder values and cataloged to false
  • After 60 seconds they were reindexed with the previous (correct) values

Issues

• Relates to celo-org/data-services#46

Checklist

• 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 added code comments for anything non trivial.
• I added documentation for my changes.
• If I added/changed/removed ENV var, I submitted a PR to https://github.com/celo-org/monorepo to update the list and default values of env vars.
• If I add new indices into DB, I checked, that they are not redundant with PGHero or other tools.

[github-actions]

Unit Test Results

       3 files  ±0     222 suites  ±0   3m 9s ⏱️ ±0s
2 048 tests ±0  2 003 ✔️ ±0  45 💤 ±0  0 ❌ ±0 

Results for commit 6e233ee. ± Comparison against base commit 6e233ee.

♻️ This comment has been updated with latest results.

[carterqw2]

Perfect