feat(3p/lisp): Add many packages

Add the following packages along with their transitive dependencies:
- trivial-ldap
- defclass-std
- easy-routes

Change-Id: Ib24517f18d14d57540362132c9a24ff2a5a4bd9d
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1336
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>
Reviewed-by: kanepyork <rikingcoding@gmail.com>

third_party/lisp/data-sift.nix

@@ -0,0 +1,27 @@
+{ depot, pkgs, ... }:
+
+let
+
+  src = pkgs.fetchFromGitHub {
+    owner = "archimag";
+    repo = "data-sift";
+    rev = "fd617d8200cdcc1b87ecf45ab59bb38e8b16ef7e";
+    sha256 = "1v7gf0x4ibjzp0c56n9m77hxdgwcm9356zlk5n4l3fx4i0hj6146";
+  };
+
+in depot.nix.buildLisp.library {
+  name = "data-sift";
+  deps = with depot.third_party.lisp; [
+    cl-ppcre
+    parse-number
+    alexandria
+    puri
+  ];
+
+  srcs = map (f: src + ("/src/" + f)) [
+    "packages.lisp"
+    "conditions.lisp"
+    "sift.lisp"
+  ];
+
+}