Add tagged template literal support for `localize` calls

Similar to https://github.com/microsoft/vscode/issues/181555 but for core strings. We propose adding an overload to `localize` that allows it to be used with [tagged template literals](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals#tagged_templates). With tagged literals, developers use a template literal as they "normally would", but prepend it with the method call ```ts localize`Hello ${name}!` ``` The associated definition for `localize()` would gain an overload: ```ts export namespace l10n { /** * Marks a string for localization. If a localized bundle is available for the language specified by * {@link env.language} and the bundle has a localized value for this message, then that localized * value will be returned (with injected {@link args} values for any templated values). * * This signature is for use with tagged template literals. The more verbose object-based * call should be used if comments are required. * * @example * ``` * localize`Hello ${name}!` * ``` * * @param message - String message components. * @param args - Replacement components in the string. * @returns localized string with injected arguments. * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals#tagged_templates */ export function t(parts: TemplateStringsArray, ...args: Array<string | number | boolean>): string; ```