feat: add DHAT profiler (#52)

Author: kcaffrey

Diff for: .gitignore

@@ -21,3 +21,6 @@ data/inputs/*
 !data/inputs/.keep
 data/puzzles/*
 !data/puzzles/.keep
+
+# Dhat
+dhat-heap.json

Diff for: Cargo.lock

@@ -5,13 +5,19 @@ authors = ["Felix Spöttel <[email protected]>"]
 edition = "2021"
 default-run = "advent_of_code"
 publish = false
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 [lib]
 doctest = false
 
 [features]
 test_lib = []
+dhat-heap = ["dhat"]
 
 [dependencies]
 pico-args = "0.5.0"
+dhat = { version = "0.3.2", optional = true }
+
+[profile.dhat]
+inherits = "release"
+debug = 1