Fetch: enable cookies and storing error messages

[mhuang74]

Improve Fetch (#77) with cookies and storing error messages.

• Add implementation, tests, and docs for --store-error flag.
• Support --cookies flag.
• Remove --jobs param since single-thread may be fast enough for most usecases.
• Update examples in Fetch.md

[jqnatividad]

Thanks for this @mhuang74 ,

The fetch_ratelimit test is failing for "Hefty Smurf" - the 5th element with --rate-limit set to 4.

Perhaps the result is inadvertently dropped when you reach the limit? But why only in Windows?

At first, I thought it might be a Github Actions runner issue, but I even tried running your PR locally on my Windows laptop and I got the same error.

[mhuang74]

Thanks @jqnatividad. I've increased burst size to 7, while keeping everything else the same, to see if error goes away.

Other issues corrected.

[jqnatividad]

Looks good!

[jqnatividad]

Closing as GH is giving false positive unmerged commits message, but it got merged just the same...
Can you confirm @mhuang74?

[mhuang74]

Closing as GH is giving false positive unmerged commits message, but it got merged just the same... Can you confirm @mhuang74?

Confirmed that all 8 commits have been merged into master. Thanks @jqnatividad!

Probably user error in VSCode that this commit got pushed to upstream directly. Oops.

e1a8a8b

UPDATE: nevermind, wasn't reading the unsquashed commit history correctly...all good.