feat(commands): totp qr code in png format

[james-d-elliott]

This allows exporting the TOTP QR code for easy registration when using authelia storage totp generate or authelia storage totp export.

[authelia]

Artifacts

These changes are published for testing on Buildkite, DockerHub and GitHub Container Registry.

Docker Container

• docker pull authelia/authelia:feat-cmd-totp-qr-code
• docker pull ghcr.io/authelia/authelia:feat-cmd-totp-qr-code

[james-d-elliott]

Converting to draft. Will be merged as part of our next feature release cycle. People can still use the binary for executing the command.

[codecov]

Codecov Report

Merging #2673 (ecdc52e) into master (6276883) will decrease coverage by 0.03%.
The diff coverage is 49.63%.

@@            Coverage Diff             @@
##           master    #2673      +/-   ##
==========================================
- Coverage   64.37%   64.33%   -0.04%     
==========================================
  Files         217      217              
  Lines       10935    11003      +68     
  Branches      278      278              
==========================================
+ Hits         7039     7079      +40     
- Misses       3393     3413      +20     
- Partials      503      511       +8     

Flag	Coverage Δ
backend	68.08% <49.63%> (-0.07%)	⬇️
frontend	41.47% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
internal/commands/storage_run.go	57.93% <47.61%> (-2.35%)	⬇️
internal/models/totp_configuration.go	88.00% <66.66%> (-12.00%)	⬇️
internal/commands/storage.go	100.00% <100.00%> (ø)
internal/ntp/util.go	88.46% <0.00%> (+11.53%)	⬆️
internal/middlewares/strip_path.go	100.00% <0.00%> (+54.54%)	⬆️