feat(tvldb): Import the tvldb/paroxysm source, add a Nix derivation

- This imports the tvldb (actually a thing called 'paroxysm') code
  from https://git.theta.eu.org/eta/paroxysm into the monorepo.
- Additionally, I did a nix thing, yay! \o/
  (well, with tazjin's help)
- 3p/default.nix needed modifying to whitelist pgsql.

Change-Id: Icdf13ca221650dde376f632bd2dd8a087af451bf
Reviewed-on: https://cl.tvl.fyi/c/depot/+/389
Reviewed-by: tazjin <mail@tazj.in>

fun/tvldb/Cargo.toml

@@ -0,0 +1,22 @@
+[package]
+authors = ["eeeeeta <eta@theta.eu.org>"]
+edition = "2018"
+name = "paroxysm"
+version = "0.1.0"
+
+[dependencies]
+chrono = "0.4.6"
+config = "0.9.1"
+env_logger = "0.6.0"
+failure = "0.1.3"
+irc = "0.13.6"
+lazy_static = "1.2.0"
+log = "0.4.6"
+rand = "0.7.3"
+regex = "1.1.0"
+serde = "1.0.81"
+serde_derive = "1.0.81"
+
+[dependencies.diesel]
+features = ["postgres", "chrono", "r2d2"]
+version = "1.3.3"