Add funnel filter metrics

[kylehuntsman]

Adds multiple metrics that help determine the number of requests being filtered out of each retrieval step, ie: indexer candidates, queries, and retrievals. Refactors some existing metrics and removes others that were not being used.

Added

• Indexer Candidates per Request: A distribution of the number of indexer candidates we receive per request
• Request with Indexer Candidates: A count of the number of requests that result in non-zero candidates from the indexer
• Request with Successful Queries: A count of the number of requests that result in a non-zero number of successful queries from SPs
• Successful Queries per Request: A distribution of the number of successful queries received per request
• Failed Retrievals per Request: A distribution of the number of failed retrieval attempts from SPs per request

Refactored

• Bitswap Request with Indexer Candidates -> Request with Indexer Candidates Filtered: A count of the number of requests that result in non-zero candidates from the indexer after filtering through allow lists and preventing concurrent retrievals from SPs.
• Bitswap Request with Successful Query -> Request with Successful Queries Filtered: A count of the number of requests that result in a non-zero number of successful queries from SPs after filtering out paid retrievals
• Retrieval Query Count -> Successful Queries per Request Filtered: A distribution of the number of successful queries received per request after filtering

Removed

• Indexer Candidates Count: Wasn't being used

Pics of updated dashboard WIP

Fixes #137

[codecov-commenter]

Codecov Report

Base: 20.66% // Head: 20.39% // Decreases project coverage by -0.27% :warning:

Coverage data is based on head (8e85efd) compared to base (0430279). Patch coverage: 55.00% of modified lines in pull request are covered.

:exclamation: Current head 8e85efd differs from pull request most recent head 22ec9ea. Consider uploading reports for the commit 22ec9ea to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #145 +/- ## ========================================== - Coverage 20.66% 20.39% -0.28% ========================================== Files 16 16 Lines 2332 2417 +85 ========================================== + Hits 482 493 +11 - Misses 1819 1895 +76 + Partials 31 29 -2 ``` | [Impacted Files](https://codecov.io/gh/application-research/autoretrieve/pull/145?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=application-research) | Coverage Δ | | |---|---|---| | [filecoin/retriever.go](https://codecov.io/gh/application-research/autoretrieve/pull/145/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=application-research#diff-ZmlsZWNvaW4vcmV0cmlldmVyLmdv) | `35.46% <55.00%> (+0.58%)` | :arrow_up: | | [main.go](https://codecov.io/gh/application-research/autoretrieve/pull/145/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=application-research#diff-bWFpbi5nbw==) | `1.29% <0.00%> (-0.10%)` | :arrow_down: | | [config.go](https://codecov.io/gh/application-research/autoretrieve/pull/145/diff?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)` | | | [autoretrieve.go](https://codecov.io/gh/application-research/autoretrieve/pull/145/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=application-research#diff-YXV0b3JldHJpZXZlLmdv) | `0.00% <0.00%> (ø)` | | | [blocks/manager.go](https://codecov.io/gh/application-research/autoretrieve/pull/145/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=application-research#diff-YmxvY2tzL21hbmFnZXIuZ28=) | `85.00% <0.00%> (+5.00%)` | :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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