Add replace_asset parameter to iter_upload_raw_asset()

[jwodder]

Closes #736.

[codecov]

Codecov Report

Merging #743 (bdb6179) into master (dd1ce9c) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #743      +/-   ##
==========================================
- Coverage   84.84%   84.83%   -0.01%     
==========================================
  Files          59       59              
  Lines        5977     5975       -2     
==========================================
- Hits         5071     5069       -2     
  Misses        906      906              

Flag	Coverage Δ
unittests	84.83% <100.00%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
dandi/dandiapi.py	93.09% <100.00%> (-0.03%)	⬇️
dandi/upload.py	83.58% <100.00%> (ø)

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[yarikoptic]

if all is good, let's also release so any testing against released version of dandi-cli is not suffering

[yarikoptic]

green now (besides codecov) - let's proceed