Replace crc dependency with our own crc implementation

It's ~30 lines to remove 2 crates in our tree.

Cargo.lock

@@ -1313,21 +1313,6 @@ dependencies = [
  "wasmtime-types",
 ]
 
-[[package]]
-name = "crc"
-version = "3.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "86ec7a15cbe22e59248fc7eadb1907dab5ba09372595da4d73dd805ed4417dfe"
-dependencies = [
- "crc-catalog",
-]
-
-[[package]]
-name = "crc-catalog"
-version = "2.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9cace84e55f07e7301bae1c519df89cdad8cc3cd868413d3fdbdeca9ff3db484"
-
 [[package]]
 name = "crc32fast"
 version = "1.3.2"
@@ -4913,7 +4898,6 @@ version = "0.1.4-alpha"
 dependencies = [
  "async-trait",
  "base58-monero",
- "crc",
  "curve25519-dalek",
  "dalek-ff-group",
  "digest_auth",