feat(tazjin/tgsa): add gpt-3 powered message translation feature

this is slow and often overloaded, but it's kind of cool when it
works. this translation method deals much better with the kind of
slang you'd see in telegram posts than any other method.

Change-Id: I7e4c845eb382f0eac627c4237b492c8e40dae574
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8625
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI

users/tazjin/tgsa/Cargo.lock

@@ -1075,6 +1075,8 @@ dependencies = [
  "ego-tree",
  "rouille",
  "scraper",
+ "serde",
+ "serde_json",
  "url",
 ]