implemented 'type' and 'wait' builtins

fixed some tcsetpgrp() misbehavior

fixed not being able to redirect stderr from builtins

Cargo.lock

@@ -533,6 +533,12 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "scopeguard"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
+
 [[package]]
 name = "semver"
 version = "1.0.27"
@@ -596,6 +602,7 @@ dependencies = [
  "pretty_assertions",
  "rand",
  "regex",
+ "scopeguard",
  "serde_json",
  "tempfile",
  "unicode-segmentation",