Revert provider rewrite

[rvagg]

.. while we can figure out why it seems to be throttling incoming requests and retrieval attempts

[codecov-commenter]

Codecov Report

Base: 4.87% // Head: 5.04% // Increases project coverage by +0.16% :tada:

Coverage data is based on head (3cae6e6) compared to base (0eeef5d). Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #169 +/- ## ========================================= + Coverage 4.87% 5.04% +0.16% ========================================= Files 15 15 Lines 1723 1666 -57 ========================================= Hits 84 84 + Misses 1634 1577 -57 Partials 5 5 ``` | [Impacted Files](https://codecov.io/gh/application-research/autoretrieve/pull/169?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=application-research) | Coverage Δ | | |---|---|---| | [bitswap/provider.go](https://codecov.io/gh/application-research/autoretrieve/pull/169?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=application-research#diff-Yml0c3dhcC9wcm92aWRlci5nbw==) | `0.00% <0.00%> (ø)` | | | [config.go](https://codecov.io/gh/application-research/autoretrieve/pull/169?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=application-research#diff-Y29uZmlnLmdv) | `0.00% <0.00%> (ø)` | | | [main.go](https://codecov.io/gh/application-research/autoretrieve/pull/169?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=application-research#diff-bWFpbi5nbw==) | `1.42% <0.00%> (+<0.01%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=application-research). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=application-research)

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[rvagg]

I've tried tinkering with our live deployment for the last >12 hours and I can't make it budge much so I'm going to revert this and deploy the old version until we can figure out what the issue is.