Merge #185: pest to chumsky migration

6026de1 remove `pest` dependency and `minimal.pest` grammar file (Volodymyr Herashchenko)
6da5555 add regression tests for the parser (Volodymyr Herashchenko)
d23e7f6 remove #[ignore] above `fuzz_slow_unit_1()` (Volodymyr Herashchenko)
b7eb350 add handling for multiple errors (Volodymyr Herashchenko)
e8b9c0e add `ErrorCollector` (Volodymyr Herashchenko)
a69f408 add `chumsky` parsing (Volodymyr Herashchenko)
79561a4 add lexer (Volodymyr Herashchenko)
e75cb5e add `chumsky` dependency (Volodymyr Herashchenko)

Pull request description:

ACKs for top commit:
  KyrylR:
    ACK 6026de1

Tree-SHA512: 6f00c3b99e2beb5081b841bc4443d09c3ff3180789938b4ff46338a117bc7a2e86fe87aebd0c87cfccd9d0dc5afdc99ad244489daf2cfca7a45a65f90f0b2832

Author: KyrylR

Cargo.lock

@@ -23,8 +23,6 @@ serde = ["dep:serde", "dep:serde_json"]
 
 [dependencies]
 base64 = "0.21.2"
-pest = "2.1.3"
-pest_derive = "2.7.1"
 serde = { version = "1.0.188", features = ["derive"], optional = true }
 serde_json = { version = "1.0.105", optional = true }
 simplicity-lang = { version = "0.7.0" }
@@ -33,6 +31,7 @@ either = "1.12.0"
 itertools = "0.13.0"
 arbitrary = { version = "1", optional = true, features = ["derive"] }
 clap = "4.5.37"
+chumsky = "0.11.2"
 
 [target.wasm32-unknown-unknown.dependencies]
 getrandom = { version = "0.2", features = ["js"] }