adds method to create image v2 direct upload url

[jacobbednarz]

This PR implements the missing feature to support images/v2/direct_upload
endpoint that lets client create direct upload url. The v2 version supports
metadata and requireSignedURLs as additional request parameters.

Closes #1248
Supersedes #1308

[github-actions]

changelog detected ✅

[codecov-commenter]

Codecov Report

Merging #1322 (768c9b2) into master (74e0b34) will decrease coverage by 0.68%.
The diff coverage is 68.05%.

@@            Coverage Diff             @@
##           master    #1322      +/-   ##
==========================================
- Coverage   48.95%   48.27%   -0.68%     
==========================================
  Files         135      133       -2     
  Lines       13180    13000     -180     
==========================================
- Hits         6452     6276     -176     
+ Misses       5212     5197      -15     
- Partials     1516     1527      +11     

Impacted Files	Coverage Δ
access_audit_log.go	79.31% <0.00%> (ø)
device_posture_rule.go	61.80% <ø> (ø)
options.go	61.01% <ø> (-3.05%)	⬇️
teams_devices.go	52.63% <ø> (ø)
dns_firewall.go	7.69% <10.00%> (-13.74%)	⬇️
images.go	44.81% <46.06%> (-5.54%)	⬇️
tunnel.go	42.41% <66.66%> (+1.01%)	⬆️
access_policy.go	70.27% <73.33%> (-6.05%)	⬇️
access_application.go	72.72% <75.47%> (-3.80%)	⬇️
access_mutual_tls_certificates.go	68.86% <75.51%> (-3.36%)	⬇️
... and 9 more

... and 1 file with indirect coverage changes

[github-actions]

This functionality has been released in v0.71.0.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!