Add rate limiting to message sending.

Cargo.lock

@@ -2066,6 +2066,50 @@ dependencies = [
  "sha-1 0.8.2",
 ]
 
+[[package]]
+name = "phf"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b2ac8b67553a7ca9457ce0e526948cad581819238f4a9d1ea74545851fa24f37"
+dependencies = [
+ "phf_macros",
+ "phf_shared",
+ "proc-macro-hack",
+]
+
+[[package]]
+name = "phf_generator"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0fc1437ada0f3a97d538f0bb608137bf53c53969028cab74c89893e1e9a12f0e"
+dependencies = [
+ "phf_shared",
+ "rand 0.8.3",
+]
+
+[[package]]
+name = "phf_macros"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b706f5936eb50ed880ae3009395b43ed19db5bff2ebd459c95e7bf013a89ab86"
+dependencies = [
+ "phf_generator",
+ "phf_shared",
+ "proc-macro-hack",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "phf_shared"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a68318426de33640f02be62b4ae8eb1261be2efbc337b60c54d845bf4484e0d9"
+dependencies = [
+ "siphasher",
+]
+
 [[package]]
 name = "pin-project"
 version = "0.4.27"
@@ -2635,6 +2679,7 @@ dependencies = [
  "nanoid 0.4.0",
  "num_enum",
  "once_cell",
+ "phf",
  "rauth",
  "regex",
  "reqwest",
@@ -3049,6 +3094,12 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "siphasher"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "729a25c17d72b06c68cb47955d44fda88ad2d3e7d77e025663fdd69b93dd71a1"
+
 [[package]]
 name = "slab"
 version = "0.4.2"