Add API method to convert redirects based on their name

[scripthunter7]

In the AST based converter we need a function from the Scriptlets library that can convert redirects by name.
Currently Scriptlets only provide a function that converts the whole rule, but when working with AST this isn't ideal behaviour.

Based on the current approach, I simply recommend the following (just add name word after redirect):

/**
 * Converts a redirect to Adg based on its name, if possible
 *
 * @param name Redirect name to convert
 * @returns Converted Adg compatible redirect name or `undefined` if the redirect isn't supported
 */
convertRedirectNameToAdg(name: string): string | undefined

CC @maximtop @slavaleleka