feat(plan): Support Create Table As Select

[srikrishnak]

• add NamedTableWriteRel type

• add CreateTableAsSelect() in builder

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Attention: Patch coverage is 61.94690% with 43 lines in your changes missing coverage. Please review.

Project coverage is 54.71%. Comparing base (9cb5896) to head (18aa6c7).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
plan/relations.go	59.64%	22 Missing and 1 partial ⚠️
plan/plan.go	75.00%	7 Missing and 1 partial ⚠️
plan/builders.go	63.15%	5 Missing and 2 partials ⚠️
expr/field_reference.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #62      +/-   ##
==========================================
+ Coverage   54.53%   54.71%   +0.17%     
==========================================
  Files          35       35              
  Lines        8006     8115     +109     
==========================================
+ Hits         4366     4440      +74     
- Misses       3441     3474      +33     
- Partials      199      201       +2     

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[EpsilonPrime]

Optional: Every time we bump the protocol version we'll need to update this file although it doesn't necessarily affect anything. That may be fine as it may prompt us to double check this file's construction but I suspect it'll be a nuisance. Does checkRoundTrip depend on this?

[srikrishnak]

@EpsilonPrime Yes, checkRoundTrip depends on this.