[BUG] Handle uninitialized spann segment reader

[sanketkedia]

Description of changes

Summarize the changes made by this PR.

• Improvements & Bug fixes
  • Handles the case when no data in the segments but only on the log for spann
  • Increase the max_block_size for local tilt to 8MB (consistent with staging/prod) since posting lists can be bigger than the size that's currently the max in local
• New functionality
  • ...

Test plan

How are these changes tested?

• Tests pass locally with pytest for python, yarn test for js, cargo test for rust

Documentation Changes

None

[github-actions]

Reviewer Checklist

Please leverage this checklist to ensure your code review is thorough before approving

Testing, Bugs, Errors, Logs, Documentation

• Can you think of any use case in which the code does not behave as intended? Have they been tested?
• Can you think of any inputs or external events that could break the code? Is user input validated and safe? Have they been tested?
• If appropriate, are there adequate property based tests?
• If appropriate, are there adequate unit tests?
• Should any logging, debugging, tracing information be added or removed?
• Are error messages user-friendly?
• Have all documentation changes needed been made?
• Have all non-obvious changes been commented?

System Compatibility

• Are there any potential impacts on other parts of the system or backward compatibility?
• Does this change intersect with any items on our roadmap, and if so, is there a plan for fitting them together?

Quality

• Is this code of a unexpectedly high quality (Readability, Modularity, Intuitiveness)

[sanketkedia]

• [ENH] Turn on spann by default #4351
• [BUG] Ann calculation in tests after collection config + handle none in collection config #4350
• [BUG] Handle uninitialized spann segment reader #4348 👈 (View in Graphite)
• [BUG] Fix race between hnsw load and hnsw purge #4345
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.