refactor: use ak.typetracer.XX high-level functions

[agoose77]

Depends upon scikit-hep/awkward#2671

[agoose77]

@douglasdavis I've removed part of an existing test that invokes dak.from_awkward upon an Awkward Array backed by a typetracer. I think this should be an error; typetracers should be an internal detail of dask-awkward. Do you agree with this? If so, I will keep the change and update the PR to add a test for the array backend in from_awkward.

[douglasdavis]

@agoose77 that test was meant to address an issue with calling from_awkward on an empty array (that test was written with this PR: #330); ak.Array(some_form.length_zero_array(highlevel=False)) was being used just to create an empty awkward array (so not using a typetracer, but an empty high level array). was the test failing for after the changes in this PR?

[agoose77]

@douglasdavis gah, I'm doing too much refactoring work in parallel — I changed the function of this test in a previous commit. Good spot, let me recover the original intention.

[codecov-commenter]

Codecov Report

Merging #351 (8670e28) into main (21fc848) will increase coverage by 0.05%.
Report is 4 commits behind head on main.
The diff coverage is 100.00%.

❗ Your organization is not using the GitHub App Integration. As a result you may experience degraded service beginning May 15th. Please install the GitHub App Integration for your organization. Read more.

@@            Coverage Diff             @@
##             main     #351      +/-   ##
==========================================
+ Coverage   94.80%   94.86%   +0.05%     
==========================================
  Files          20       20              
  Lines        2485     2475      -10     
==========================================
- Hits         2356     2348       -8     
+ Misses        129      127       -2     

Files Changed	Coverage Δ
src/dask_awkward/__init__.py	100.00% <ø> (ø)
src/dask_awkward/lib/__init__.py	100.00% <ø> (ø)
src/dask_awkward/lib/io/io.py	100.00% <ø> (ø)
src/dask_awkward/layers/layers.py	94.79% <100.00%> (-0.21%)	⬇️
src/dask_awkward/lib/core.py	91.97% <100.00%> (-0.03%)	⬇️
src/dask_awkward/lib/io/parquet.py	93.29% <100.00%> (+1.21%)	⬆️

... and 2 files with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[douglasdavis]

@agoose77 sounds good- if you have nothing else to add this looks good to me!