Improved README

[jorgecarleitao]

• Added enumeration of current features
• removed section with discussion on why Arrow API has issues (it belongs somewhere else)
• Removed section with feature-comparison it with arrow (it tends to get outdated from both ends)
• added section with our safety and security practices and main associated risks
• Expanded section on what is being tested for interoperability

[jorgecarleitao]

@houqp @Dandandan @ritchie46 @sundy-li , could you assess whether the new wording is balanced?

[codecov]

Codecov Report

Merging #735 (668dad9) into main (c28d69e) will increase coverage by 0.38%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #735      +/-   ##
==========================================
+ Coverage   70.53%   70.91%   +0.38%     
==========================================
  Files         311      311              
  Lines       16920    17355     +435     
==========================================
+ Hits        11934    12308     +374     
- Misses       4986     5047      +61     

Impacted Files	Coverage Δ
src/io/avro/read/deserialize.rs	66.47% <0.00%> (-0.48%)	⬇️
src/io/ipc/write/schema.rs	92.44% <0.00%> (-0.34%)	⬇️
src/io/ipc/read/reader.rs	72.18% <0.00%> (-0.28%)	⬇️
benches/filter_kernels.rs	0.00% <0.00%> (ø)
src/datatypes/mod.rs	98.11% <0.00%> (+0.89%)	⬆️
src/datatypes/schema.rs	25.00% <0.00%> (+1.00%)	⬆️
src/io/json_integration/read/schema.rs	65.24% <0.00%> (+1.24%)	⬆️
src/io/parquet/read/schema/convert.rs	84.61% <0.00%> (+6.64%)	⬆️
src/datatypes/field.rs	36.20% <0.00%> (+8.75%)	⬆️
src/io/ipc/read/schema.rs	90.13% <0.00%> (+9.48%)	⬆️

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[sundy-li]

/LGTM