### Godot version

3.5.1.stable, v4.0.beta.custom_build [0a87ead64]

### System information

Ubuntu 22.04.1

### Issue description

For example, if project has name "300spartans", we can't enter the "org.godotengine.300spartans" to "Unique Name" field. We get the error "Invalid package name: A digit cannot be the first character in a package segment". But , if we enter "org.godotengine.$genname", there will be no error message. When exporting, the name will be set as "org.godotengine.spartans" without "300" in beginning, but user will not be informed about it. I think, it is not very good. It may not be worth making changes to the source code, but mention it in the documentation.

### Steps to reproduce

See issue description.

### Minimal reproduction project

N/A
}
		if (first && is_digit(c)) {
			if (r_error) {
				*r_error = TTR("A digit cannot be the first character in a package segment.");
			}
			return false;
		}
		if (first && is_underscore(c)) {
			if (r_error) {
				*r_error = vformat(TTR("The character '%s' cannot be the first character in a package segment."), String::chr(c));
			}
			return false;
		}
		first = false;
	}
	if (segments == 0) {
		if (r_error) {
			*r_error = TTR("The package must have at least one '.' separator.");
		}
		return false;
	}
	if (first) {
		if (r_error) {
			*r_error = TTR("Package segments must be of non-zero length.");
		}
		return false;
	}
	return true;
}
bool EditorExportPlatformAndroid::_should_compress_asset(const String &p_path, const Vector<uint8_t> &p_data) {