Implement dbt exposure selector

[ghjklw]

Description

Implement dbt exposure selector, following exactly the same pattern as source.

Related Issue(s)

Closes #1551

Breaking Change?

No

Checklist

• I have made corresponding changes to the documentation (if required)
• I have added tests that prove my fix is effective or that my feature works

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[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 2 lines in your changes missing coverage. Please review.

Project coverage is 97.31%. Comparing base (0811e46) to head (521a943).

Files with missing lines	Patch %	Lines
cosmos/dbt/selector.py	90.47%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1559      +/-   ##
==========================================
- Coverage   97.34%   97.31%   -0.03%     
==========================================
  Files          80       80              
  Lines        4903     4923      +20     
==========================================
+ Hits         4773     4791      +18     
- Misses        130      132       +2     

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[tatiana]

This is a great feature. Thank you for extending Cosmos selectors, @ghjklw !
Since it is a new feature, we'll be releasing this in Cosmos 1.10

I'm happy for us to merge this feature once the tests are passing - could you please address the codecov feedback?