feat: replace async-trait with erased box type

Signed-off-by: kjuulh <contact@kjuulh.io>

Cargo.lock

@@ -17,17 +17,6 @@ version = "1.0.100"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a23eb6b1614318a8071c9b2521f36b424b2c83db5eb3a0fead4a6c0809af6e61"
 
-[[package]]
-name = "async-trait"
-version = "0.1.89"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9035ad2d096bed7955a320ee7e2230574d28fd3c3a0f186cbea1ff3c7eed5dbb"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
-
 [[package]]
 name = "autocfg"
 version = "1.4.0"
@@ -225,7 +214,6 @@ name = "notmad"
 version = "0.10.0"
 dependencies = [
  "anyhow",
- "async-trait",
  "futures",
  "futures-util",
  "rand",