Add `databricks_file` resource

[hectorcast-db]

Changes

Add databricks_file resource

Tests

• [X] make test run locally
• [X] relevant change in docs/ folder
• [X] covered with integration tests in internal/acceptance
• [ ] (running) relevant acceptance tests are passing
• [X] using Go SDK

[codecov-commenter]

Codecov Report

Attention: 30 lines in your changes are missing coverage. Please review.

Comparison is base (d0a7413) 83.72% compared to head (b0ff36c) 83.64%.

:exclamation: Current head b0ff36c differs from pull request most recent head 817501d. Consider uploading reports for the commit 817501d to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3265      +/-   ##
==========================================
- Coverage   83.72%   83.64%   -0.09%     
==========================================
  Files         173      174       +1     
  Lines       15757    15851      +94     
==========================================
+ Hits        13193    13259      +66     
- Misses       1789     1805      +16     
- Partials      775      787      +12     

Files	Coverage Δ
provider/provider.go	94.62% <100.00%> (+0.02%)	:arrow_up:
workspace/file_resource.go	91.22% <0.00%> (-5.07%)	:arrow_down:
storage/resource_file.go	72.41% <72.41%> (ø)

... and 1 file with indirect coverage changes

[alexott]

I'm not sure about the name - it's too generic if it allows to work only with Volumes... Or do we plan to use the same resource for all file types - DBFS, WSFS, etc.? But documentation mentions only Volumes, and if it's true, then it should be called like databricks_volume_file, not generic databricks_file

[hectorcast-db]

@alexott For now, it only supports Volumes, but they plan to expand to other resources. We are discussing possible changes to the docs.