Add config for disable BF load

[xiaofan-luan]

see also #22994
Signed-off-by: xiaofan-luan xiaofan.luan@zilliz.com

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[codecov]

Codecov Report

Merging #22996 (72d2fe1) into master (5a914ae) will decrease coverage by 0.60%.
The diff coverage is 68.00%.

@@            Coverage Diff             @@
##           master   #22996      +/-   ##
==========================================
- Coverage   82.09%   81.49%   -0.60%     
==========================================
  Files         728      789      +61     
  Lines       98619   105371    +6752     
==========================================
+ Hits        80958    85876    +4918     
- Misses      14634    16197    +1563     
- Partials     3027     3298     +271     

Impacted Files	Coverage Δ
internal/querynode/segment_loader.go	80.20% <0.00%> (-0.43%)	⬇️
internal/querynode/segment.go	81.04% <20.00%> (-0.45%)	⬇️
internal/proxy/task_index.go	73.58% <100.00%> (+1.33%)	⬆️
internal/util/paramtable/component_param.go	98.07% <100.00%> (+0.02%)	⬆️

... and 114 files with indirect coverage changes

[czs007]

/lgtm