Exposure Globus "label" directly to all top-level download functions

[eigenbrot]

This resulted in removing the label_suffix from some intermediate functions. I
think this way is better because it gives total control to the user. The default
values have only been changed very slightly.

Fixes #184. I hope I did this right.

[codecov]

Codecov Report

Merging #193 (c87e94a) into main (a75bf4e) will decrease coverage by 0.13%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #193      +/-   ##
==========================================
- Coverage   96.26%   96.13%   -0.14%     
==========================================
  Files          29       29              
  Lines        1501     1500       -1     
==========================================
- Hits         1445     1442       -3     
- Misses         56       58       +2     

Impacted Files	Coverage Δ
dkist/io/file_manager.py	95.83% <100.00%> (ø)
dkist/net/globus/transfer.py	98.36% <100.00%> (ø)
dkist/net/helpers.py	100.00% <100.00%> (ø)
dkist/io/asdf/entry_points.py	93.33% <0.00%> (-6.67%)	⬇️
dkist/io/asdf/converters/file_manager.py	92.00% <0.00%> (-4.00%)	⬇️
dkist/dataset/dataset.py	93.82% <0.00%> (-0.23%)	⬇️
dkist/net/attr_walker.py	100.00% <0.00%> (ø)

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[Cadair]

Thanks @eigenbrot for a lovely PR 😄