Improve Bash syntax highlighting

[chbk]

Release Notes:

• Improved Bash syntax highlighting

Zed 0.174.6	With this PR

• string: string
• variable: property -> variable
• number: number
• regex: string.regex
• >&, >&-, :, //, /, %, %%, #, ##, =, ==: operator
• -lt, -le, -gt, -ge, -eq, -ne, -z, -n: keyword.operator
• ;: punctuation.delimiter
• (, ), {, }, [, ]: punctuation.bracket
• $, ${ }, $( ): punctuation.special, as defined in other languages

variable=I\ like\ Zed
function my_function() {
  echo "Hello world, ${variable//regex/string}" > file
}
if [ $(uid) -lt 600 ]; then
  my_function;
  cat file | grep hello >&3
fi

[maxdeviant]

Thank you!