split frames for large graphs

[fjetter]

There's been a report about HLG serialization to be broken for very large graphs, see #5581 (comment) due to a msgpack limitation

I'm not entirely sure what's happening but this serialize/serialize_and_aplit thing may be related. We've seen slow transmissions of large grpahs in the past and I will have to review this closely because I don't want our transmission to be slower than it already is. This would break up the frames into 64MB chunks by default which might not be what we want.

[github-actions]

Unit Test Results

See test report for an extended history of previous test failures. This is useful for diagnosing flaky tests.

    29 files  ±0      29 suites  ±0   11h 4m 35s ⏱️ + 2m 3s
 4 058 tests ±0   3 957 ✅ ±0     97 💤 ±0  4 ❌ ±0 
55 897 runs  ±0  53 729 ✅  - 1  2 162 💤 ±0  6 ❌ +1 

For more details on these failures, see this check.

Results for commit 9ce84ab. ± Comparison against base commit 9672121.