feat: configurable record batches in flight

[ShiKaiWi]

Which issue does this PR close?

Closes #735

Rationale for this change

Currently, streaming reading sst has already been supported. However, the max record batches in flight is not configurable, which is hard-coded as 1024. This pr makes it configurable, especially for normal query and compaction reading.

What changes are included in this PR?

• Make scan_max_record_batches_in_flight configurable;
• Refactor the implementation for Stream based on a future method;

Are there any user-facing changes?

A new config options is provided called `scan_max_record_batches_in_flight.

How does this change test

Existing tests.

[codecov-commenter]

Codecov Report

Merging #759 (2569487) into main (99f2cf4) will decrease coverage by 0.01%.
The diff coverage is 96.47%.

❗ Current head 2569487 differs from pull request most recent head 6585f8c. Consider uploading reports for the commit 6585f8c to get more accurate results

@@            Coverage Diff             @@
##             main     #759      +/-   ##
==========================================
- Coverage   68.20%   68.19%   -0.01%     
==========================================
  Files         296      296              
  Lines       46057    46066       +9     
==========================================
+ Hits        31411    31415       +4     
- Misses      14646    14651       +5     

Impacted Files	Coverage Δ
analytic_engine/src/instance/mod.rs	83.33% <ø> (ø)
tools/src/bin/sst-convert.rs	1.20% <0.00%> (ø)
analytic_engine/src/instance/flush_compaction.rs	92.68% <95.00%> (+0.04%)	⬆️
analytic_engine/src/instance/read.rs	78.15% <97.26%> (+3.15%)	⬆️
analytic_engine/src/compaction/scheduler.rs	74.41% <100.00%> (+0.22%)	⬆️
analytic_engine/src/instance/open.rs	80.52% <100.00%> (+0.58%)	⬆️
analytic_engine/src/lib.rs	98.79% <100.00%> (+0.01%)	⬆️
analytic_engine/src/row_iter/dedup.rs	94.32% <100.00%> (+0.04%)	⬆️
analytic_engine/src/row_iter/merge.rs	92.79% <100.00%> (-0.55%)	⬇️
analytic_engine/src/row_iter/mod.rs	100.00% <100.00%> (+9.09%)	⬆️
... and 3 more

... and 4 files with indirect coverage changes

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[jiacai2050]

LGTM