Added MutableUtf8Array::into_data

[ritchie46]

Similar to already existing implementations on MutablePrimitive and MutableStruct.

[codecov]

Codecov Report

Merging #1170 (e7f61ee) into main (3fdb33f) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #1170      +/-   ##
==========================================
- Coverage   83.73%   83.73%   -0.01%     
==========================================
  Files         365      365              
  Lines       35847    35850       +3     
==========================================
+ Hits        30018    30019       +1     
- Misses       5829     5831       +2     

Impacted Files	Coverage Δ
src/array/utf8/mutable.rs	89.77% <0.00%> (-0.76%)	⬇️
src/io/ipc/read/array/boolean.rs	90.74% <0.00%> (-7.41%)	⬇️
src/io/ipc/read/reader.rs	96.32% <0.00%> (+0.33%)	⬆️
src/io/ipc/read/file_async.rs	61.19% <0.00%> (+0.74%)	⬆️
src/io/ipc/read/stream_async.rs	76.71% <0.00%> (+1.36%)	⬆️

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