[security] Reduce page load bundle to under 100kB

[tylersmalley]

For details, refer to the meta issue at #95853

The security plugin is currently 125,722 bytes. To consider this issue closed, the limits.yml should be updated with the value under 100000.

[elasticmachine]

Pinging @elastic/kibana-security (Team:Security)

[jportner]

I attempted to address this pretty recently while I was cleaning up the Security plugin imports, but I wasn't able to move the needle during the timebox I'd set for myself, so I moved on to other tasks. I figured I'd leave a comment for whomever takes this on in the future while this is still fresh in my mind!

I've attached a snapshot of the security plugin build stats from the master branch today (HEAD: 0e40b94):
stats.json.zip

Command to generate plugin chunks and stats.json file:

node scripts/build_kibana_platform_plugins.js --dist --profile --focus=security
ls -lh x-pack/plugins/security/target/public

Using https://chrisbateman.github.io/webpack-visualizer/ to analyze it:

• Our two biggest dependencies are broadcast-channel (23k) and url (14k), I'm not sure we can get rid of either of these
• We have what appears to be a lot of static exports, too (33k):
  

Other than that, we already use lazy-loading, and the security plugin is split into 19 chunks.