Use `write_all` when writing blob data to file system

[sandreae]

We should use write_all instead of write when writing blob data to the filesystem as the latter only represents a "single attempt" to write a buffer to a file, whereas the former "continuously calls [write] until there is no more data to be written" or an error occurs. In using the later we were sometimes silently failing to write all data to the file system.

Closes #586

📋 Checklist

• [x] Add tests that cover your changes
• [x] Add this PR to the Unreleased section in CHANGELOG.md
• [x] Link this PR to any issues it closes
• [x] New files contain a SPDX license header

[adzialocha]

Really good to know ✨✊🏻

[codecov[bot]]

Codecov Report

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

Comparison is base (4809fab) 92.67% compared to head (9ca7317) 92.68%. Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #587 +/- ## ========================================== + Coverage 92.67% 92.68% +0.01% ========================================== Files 106 106 Lines 18384 18405 +21 ========================================== + Hits 17037 17059 +22 + Misses 1347 1346 -1 ``` | [Files](https://app.codecov.io/gh/p2panda/aquadoggo/pull/587?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=p2panda) | Coverage Δ | | |---|---|---| | [aquadoggo/src/db/stores/document.rs](https://app.codecov.io/gh/p2panda/aquadoggo/pull/587?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=p2panda#diff-YXF1YWRvZ2dvL3NyYy9kYi9zdG9yZXMvZG9jdW1lbnQucnM=) | `98.76% <100.00%> (-0.10%)` | :arrow_down: | | [aquadoggo/src/db/stores/operation.rs](https://app.codecov.io/gh/p2panda/aquadoggo/pull/587?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=p2panda#diff-YXF1YWRvZ2dvL3NyYy9kYi9zdG9yZXMvb3BlcmF0aW9uLnJz) | `89.74% <100.00%> (+0.11%)` | :arrow_up: | | [aquadoggo/src/materializer/tasks/blob.rs](https://app.codecov.io/gh/p2panda/aquadoggo/pull/587?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=p2panda#diff-YXF1YWRvZ2dvL3NyYy9tYXRlcmlhbGl6ZXIvdGFza3MvYmxvYi5ycw==) | `87.09% <100.00%> (+2.84%)` | :arrow_up: | | [aquadoggo/src/materializer/tasks/reduce.rs](https://app.codecov.io/gh/p2panda/aquadoggo/pull/587?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=p2panda#diff-YXF1YWRvZ2dvL3NyYy9tYXRlcmlhbGl6ZXIvdGFza3MvcmVkdWNlLnJz) | `94.84% <100.00%> (-0.09%)` | :arrow_down: | | [aquadoggo/src/test\_utils/node.rs](https://app.codecov.io/gh/p2panda/aquadoggo/pull/587?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=p2panda#diff-YXF1YWRvZ2dvL3NyYy90ZXN0X3V0aWxzL25vZGUucnM=) | `95.00% <100.00%> (ø)` | | ... and [2 files with indirect coverage changes](https://app.codecov.io/gh/p2panda/aquadoggo/pull/587/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=p2panda)

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