Add shell-completions for dx (#5232)

* add naive shell completion using clap_complete

* first pass completions

* simpler toggle

---------

Co-authored-by: Jonathan Kelley <jkelleyrtp@gmail.com>

Cargo.lock

@@ -3452,6 +3452,18 @@ dependencies = [
  "terminal_size",
 ]
 
+[[package]]
+name = "clap_complete"
+version = "4.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "19c9f1dde76b736e3681f28cec9d5a61299cbaae0fce80a68e43724ad56031eb"
+dependencies = [
+ "clap",
+ "clap_lex",
+ "is_executable",
+ "shlex",
+]
+
 [[package]]
 name = "clap_derive"
 version = "4.5.61"
@@ -4855,6 +4867,7 @@ dependencies = [
  "cargo_toml",
  "chrono",
  "clap",
+ "clap_complete",
  "codemap",
  "console 0.16.3",
  "console-subscriber",
@@ -9142,6 +9155,15 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7655c9839580ee829dfacba1d1278c2b7883e50a277ff7541299489d6bdfdc45"
 
+[[package]]
+name = "is_executable"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baabb8b4867b26294d818bf3f651a454b6901431711abb96e296245888d6e8c4"
+dependencies = [
+ "windows-sys 0.60.2",
+]
+
 [[package]]
 name = "is_terminal_polyfill"
 version = "1.70.2"