Add reading metadata from Arrow.Table

[bkamins]

Partially solves https://github.com/apache/arrow-julia/issues/337 for Arrow.Table.

[codecov-commenter]

Codecov Report

Merging #481 (af5621e) into main (95efe95) will increase coverage by 0.07%. The diff coverage is 96.42%.

@@            Coverage Diff             @@
##             main     #481      +/-   ##
==========================================
+ Coverage   87.45%   87.52%   +0.07%     
==========================================
  Files          26       26              
  Lines        3283     3311      +28     
==========================================
+ Hits         2871     2898      +27     
- Misses        412      413       +1     

Files Changed	Coverage Δ
src/table.jl	92.70% <96.42%> (+0.21%)	:arrow_up:

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[bkamins]

bump

@quinnj - there are recurring requests for this functionality

[asinghvi17]

Bump - would it be possible to get this PR in, even if only for tables?