Adding Multi Profile/Env Support

[zacdav-db]

To Do:

• [x] Unit tests
• [x] Update auth vignette
• [x] Validate behaviour on windows/linux/mac for .databrickscfg
• [x] Update docs for db_host()/db_token()/db_wsid()

[codecov-commenter]

Codecov Report

Merging #22 (e9657c7) into main (2c427b8) will increase coverage by 0.60%. The diff coverage is 40.00%.

@@            Coverage Diff             @@
##             main      #22      +/-   ##
==========================================
+ Coverage   11.06%   11.67%   +0.60%     
==========================================
  Files          22       22              
  Lines        2675     2698      +23     
==========================================
+ Hits          296      315      +19     
- Misses       2379     2383       +4     

Impacted Files	Coverage Δ
R/package-auth.R	44.18% <40.00%> (+44.18%)	:arrow_up:

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