refactor: generator writing to graph store

[tpluscode]

We can preserve the behaviour of no request being sent easily by replacing the stream transform with an async generator.

[changeset-bot[bot]]

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Latest commit: 86576d588c2c60403e56a46681f7cf9be094862a

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.93%. Comparing base (b02b00c) to head (86576d5).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## sparql-v3 #284 +/- ## ============================================= - Coverage 84.94% 84.93% -0.02% ============================================= Files 172 172 Lines 6861 6869 +8 Branches 102 102 ============================================= + Hits 5828 5834 +6 - Misses 1031 1033 +2 Partials 2 2 ``` | [Flag](https://app.codecov.io/gh/zazuko/barnard59/pull/284/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zazuko) | Coverage Δ | | |---|---|---| | [barnard59](https://app.codecov.io/gh/zazuko/barnard59/pull/284/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zazuko) | `81.20% <ø> (ø)` | | | [barnard59-base](https://app.codecov.io/gh/zazuko/barnard59/pull/284/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zazuko) | `47.97% <ø> (ø)` | | | [barnard59-core](https://app.codecov.io/gh/zazuko/barnard59/pull/284/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zazuko) | `90.92% <ø> (ø)` | | | [barnard59-csvw](https://app.codecov.io/gh/zazuko/barnard59/pull/284/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zazuko) | `80.21% <ø> (ø)` | | | [barnard59-cube](https://app.codecov.io/gh/zazuko/barnard59/pull/284/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zazuko) | `96.39% <ø> (ø)` | | | [barnard59-formats](https://app.codecov.io/gh/zazuko/barnard59/pull/284/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zazuko) | `32.63% <ø> (ø)` | | | [barnard59-ftp](https://app.codecov.io/gh/zazuko/barnard59/pull/284/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zazuko) | `85.38% <ø> (ø)` | | | [barnard59-graph-store](https://app.codecov.io/gh/zazuko/barnard59/pull/284/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zazuko) | `94.11% <100.00%> (-1.06%)` | :arrow_down: | | [barnard59-http](https://app.codecov.io/gh/zazuko/barnard59/pull/284/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zazuko) | `87.50% <ø> (ø)` | | | [barnard59-rdf](https://app.codecov.io/gh/zazuko/barnard59/pull/284/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zazuko) | `94.95% <ø> (ø)` | | | [barnard59-s3](https://app.codecov.io/gh/zazuko/barnard59/pull/284/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zazuko) | `100.00% <ø> (ø)` | | | [barnard59-shacl](https://app.codecov.io/gh/zazuko/barnard59/pull/284/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zazuko) | `52.17% <ø> (ø)` | | | [barnard59-sparql](https://app.codecov.io/gh/zazuko/barnard59/pull/284/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zazuko) | `94.93% <ø> (ø)` | | | [barnard59-validation](https://app.codecov.io/gh/zazuko/barnard59/pull/284/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zazuko) | `97.53% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zazuko#carryforward-flags-in-the-pull-request-comment) to find out more.

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