read clks in a streaming fashion

[wilko77]

Not sure about the API change. Maybe introduce an extra function?

However, this way of doing things is:

• faster: I measured up to 20% for large files
• less memory demand: I measured about 33% memory consumption compared to std clkhash.

[codecov[bot]]

Codecov Report

Merging #673 (c943981) into main (d606c9a) will decrease coverage by 2.21%. The diff coverage is 72.41%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #673 +/- ## ========================================== - Coverage 94.42% 92.21% -2.21% ========================================== Files 13 13 Lines 969 1028 +59 ========================================== + Hits 915 948 +33 - Misses 54 80 +26 ```

[wilko77]

superseded by #675