Accept and manage cookies when requesting gateways

[wjsi]

This PR adds an accept_cookies argument to GatewayClient class. Once enabled, GatewayClient accepts and manages cookie expiration when receiving cookies generated by load balancers serving notebook gateways. These cookies will be sent back in request headers for load balancers to decide which backend node to use.

Purposes and discussions in #967.

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[codecov-commenter]

Codecov Report

Merging #969 (0e460ba) into main (4a34e6a) will increase coverage by 0.19%.
The diff coverage is 89.79%.

❗ Current head 0e460ba differs from pull request most recent head e86d938. Consider uploading reports for the commit e86d938 to get more accurate results

@@            Coverage Diff             @@
##             main     #969      +/-   ##
==========================================
+ Coverage   72.30%   72.49%   +0.19%     
==========================================
  Files          64       64              
  Lines        8136     8185      +49     
  Branches     1358     1371      +13     
==========================================
+ Hits         5883     5934      +51     
+ Misses       1843     1839       -4     
- Partials      410      412       +2     

Impacted Files	Coverage Δ
jupyter_server/gateway/gateway_client.py	76.84% <89.79%> (+5.65%)	⬆️

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[kevin-bates]

Hi @wjsi - this looks good - I just had the one suggestion.

If you could also update with main, that would be great. Thank you.

[kevin-bates]

LGTM - thank you @wjsi!

I suspect the test failure is unrelated, but holding off on the merge until we can confirm tomorrow.

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[blink1073]

I suspect the test failure is unrelated

Yep, thanks @wjsi and @kevin-bates!