Add additional API method helpers to access workspace locations

[ascopes]

Closes #337 - adds new helper methods to the workspace API for accessing paths and locations within a workspace object within tests.

[github-actions]

Test Results

  1 604 files  ±    0    1 604 suites  ±0   0s ⏱️ ±0s
23 016 tests +300  23 003 ✔️ +300  13 💤 ±0  0 ❌ ±0 
23 280 runs  +300  23 267 ✔️ +300  13 💤 ±0  0 ❌ ±0 

Results for commit 6155ca5. ± Comparison against base commit e84ec9a.

[codecov-commenter]

Codecov Report

Merging #339 (6155ca5) into main (e84ec9a) will decrease coverage by 0.62%.
The diff coverage is 48.14%.

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@@            Coverage Diff             @@
##             main     #339      +/-   ##
==========================================
- Coverage   79.31%   78.69%   -0.62%     
==========================================
  Files          91       91              
  Lines        2731     2784      +53     
  Branches      227      231       +4     
==========================================
+ Hits         2166     2191      +25     
- Misses        506      534      +28     
  Partials       59       59              

Impacted Files	Coverage Δ
...hub/ascopes/jct/workspaces/impl/WorkspaceImpl.java	26.82% <3.44%> (-13.92%)	⬇️
...va/io/github/ascopes/jct/workspaces/Workspace.java	100.00% <100.00%> (ø)