Add validate method for MultiTableMetadata

[pvk-developer]

Resolves #888

[codecov-commenter]

Codecov Report

Merging #954 (33ec1c5) into V1.0.0.dev (97a9b5c) will increase coverage by 0.41%. The diff coverage is 100.00%.

@@              Coverage Diff               @@
##           V1.0.0.dev     #954      +/-   ##
==============================================
+ Coverage       73.97%   74.39%   +0.41%     
==============================================
  Files              40       40              
  Lines            3477     3534      +57     
==============================================
+ Hits             2572     2629      +57     
  Misses            905      905              

Impacted Files	Coverage Δ
sdv/metadata/multi_table.py	99.15% <100.00%> (+0.25%)	:arrow_up:
sdv/metadata/single_table.py	99.13% <100.00%> (+<0.01%)	:arrow_up:

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