Add drop_schema_named macro

[colin-rogers-dbt]

resolves #8025

Tested on a couple adapters, there's some variance in api.Relation.create but I think the default will work for most adapters

Problem

Solution

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX
• This PR includes type annotations for new and modified functions

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (efa6339) 86.35% compared to head (d58e412) 86.29%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8868      +/-   ##
==========================================
- Coverage   86.35%   86.29%   -0.07%     
==========================================
  Files         177      177              
  Lines       26383    26383              
==========================================
- Hits        22784    22768      -16     
- Misses       3599     3615      +16     

Flag	Coverage Δ
integration	83.08% <ø> (-0.15%)	⬇️
unit	64.59% <ø> (ø)

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see 5 files with indirect coverage changes

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[ChenyuLInx]

Thanks @colin-rogers-dbt