fix: block wait timeout & more provider & block debugging

[rvagg]

• lots of block provider debugging messages so you can see the passage of blocks through to the bitswap message
• provide a timeout error on the AwaitBlock callback so you can do something with it in that case (including sending a dont_have, although that might be silly 10 minutes late?)
• properly wire up the AwaitBlock timeout to the BlockManager instantiation

[codecov-commenter]

Codecov Report

Base: 5.96% // Head: 5.59% // Decreases project coverage by -0.36% :warning:

Coverage data is based on head (66e6bc8) compared to base (cb0b9e3). Patch coverage: 21.42% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #157 +/- ## ========================================= - Coverage 5.96% 5.59% -0.37% ========================================= Files 10 10 Lines 1509 1536 +27 ========================================= - Hits 90 86 -4 - Misses 1416 1445 +29 - Partials 3 5 +2 ``` | [Impacted Files](https://codecov.io/gh/application-research/autoretrieve/pull/157?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/157/diff?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)` | | | [blocks/manager.go](https://codecov.io/gh/application-research/autoretrieve/pull/157/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=application-research#diff-YmxvY2tzL21hbmFnZXIuZ28=) | `78.64% <69.23%> (-6.36%)` | :arrow_down: | 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]

• added a further change that removes the error entirely from AwaitBlock and only provides it on the callback