feat(output): auto-open HTML file after scan

[hogo6002]

Added support to automatically open the HTML file in users' default browser after a scan finishes.

If the host flag is enabled, the HTML file will be saved in a temporary directory and then served on localhost.

If only specified the --format html, open the generated HTML file by using the right open command for each OS (like xdg-open for Linux, start for Windows, and open for macOS). Simultaneously, the file is served on localhost for easy remote access.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 2.22222% with 44 lines in your changes missing coverage. Please review.

Project coverage is 69.76%. Comparing base (fe13252) to head (1d97d0d).

Files with missing lines	Patch %	Lines
cmd/osv-scanner/scan/main.go	2.22%	42 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               v2    #1412      +/-   ##
==========================================
- Coverage   69.92%   69.76%   -0.17%     
==========================================
  Files         186      186              
  Lines       18518    18562      +44     
==========================================
  Hits        12949    12949              
- Misses       4874     4916      +42     
- Partials      695      697       +2     

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[hogo6002]

Hmm, thinking a bit more, if we host it on a localhost port, users could potentially use SSH port forwarding to access the website if they are remotely accessing the server. But I don't know how likely this case would be.
ssh -L local_port:destination_server_ip:remote_port ssh_server_hostname

[oliverchang]

Hmm, thinking a bit more, if we host it on a localhost port, users could potentially use SSH port forwarding to access the website if they are remotely accessing the server. But I don't know how likely this case would be. ssh -L local_port:destination_server_ip:remote_port ssh_server_hostname

This is the workflow I typically use whenever I need to inspect a web page generated by some tool (e.g. documentation)

[hogo6002]

This is the workflow I typically use whenever I need to inspect a web page generated by some tool (e.g. documentation)

Updated code to also host the HTML file on localhost

[another-rex]

Let's add a flag --host or similar where we assume output is a temporary file, format is html, and run the hosting part of the code