feat: add materialize view

[pmakani]

No description provided.

[codecov]

Codecov Report

Merging #174 into master will decrease coverage by 0.02%.
The diff coverage is 71.87%.

@@             Coverage Diff              @@
##             master     #174      +/-   ##
============================================
- Coverage     77.36%   77.33%   -0.03%     
- Complexity     1116     1123       +7     
============================================
  Files            73       74       +1     
  Lines          5950     5982      +32     
  Branches        626      635       +9     
============================================
+ Hits           4603     4626      +23     
  Misses         1019     1019              
- Partials        328      337       +9

Impacted Files	Coverage Δ	Complexity Δ
...ava/com/google/cloud/bigquery/TableDefinition.java	87.09% <100%> (+0.88%)	8 <0> (+1)	⬆️
...gle/cloud/bigquery/MaterializedViewDefinition.java	70% <70%> (ø)	6 <6> (?)

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[shollyman]

Still waiting on the backend team to confirm path forward regarding updates.

[gcf-merge-on-green]

Your PR was not mergeable because either one of your required status checks failed, or one of your required reviews was not approved. See required reviews for your repo here: https://github.com/googleapis/sloth/blob/master/required-checks.json