feat: build invert index distributely

[chenkovsky]

Related to #3269.

I want to build an inverted index for Lance on a distributed system(ray/spark). Currently, I have modified the interface for creating an index to allow an array of fragment IDs to be passed in. If this array is passed in, the index creation interface will return an index object.

I also changed CreateIndex operation definition in python, make it similar to rust version. I don't know why it's different from rust version.

https://www.elastic.co/blog/understanding-query-then-fetch-vs-dfs-query-then-fetch

both query-then-fetch & dfs-query-then-fetch are supported.
query-then-fetch is fast, and not accurate, if the number of texts is big, this mode is good enough, it's also default mode of es.
dfs-query-then-fetch is slow, but accurate. it's very useful if data is skew or small.

next step I also want to do fts query distributely.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 58.73016% with 104 lines in your changes missing coverage. Please review.

Project coverage is 78.62%. Comparing base (8a61b69) to head (a178e89).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
rust/lance/src/io/exec/fts.rs	40.50%	38 Missing and 9 partials ⚠️
rust/lance-index/src/scalar/inverted/index.rs	79.27%	20 Missing and 3 partials ⚠️
rust/lance/src/index/scalar.rs	5.88%	15 Missing and 1 partial ⚠️
rust/lance-index/src/scalar.rs	10.00%	9 Missing ⚠️
rust/lance/src/index.rs	76.19%	2 Missing and 3 partials ⚠️
rust/lance-index/src/scalar/inverted/wand.rs	76.92%	3 Missing ⚠️
rust/lance/src/dataset.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3452      +/-   ##
==========================================
- Coverage   78.93%   78.62%   -0.32%     
==========================================
  Files         251      251              
  Lines       92267    93129     +862     
  Branches    92267    93129     +862     
==========================================
+ Hits        72833    73224     +391     
- Misses      16463    16929     +466     
- Partials     2971     2976       +5     

Flag	Coverage Δ
unittests	78.62% <58.73%> (-0.32%)	⬇️

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[chenkovsky]

@BubbleCal could you please help review this PR?