### 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
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	};
	for (const char **ext = unconditional_compress_ext; *ext; ++ext) {
		if (p_path.to_lower().ends_with(String(*ext))) {
			return false;
		}
	}
	
	if (p_data.size() >= 4 && p_data[0] == 'R' && p_data[1] == 'S' && p_data[2] == 'C' && p_data[3] == 'C') {
		
		return false;
	}
	
	return true;
}
zip_fileinfo EditorExportPlatformAndroid::get_zip_fileinfo() {
	OS::DateTime dt = OS::get_singleton()->get_datetime();
	zip_fileinfo zipfi;
	zipfi.tmz_date.tm_year = dt.year;
	zipfi.tmz_date.tm_mon = dt.month - 1; 
	zipfi.tmz_date.tm_mday = dt.day;
	zipfi.tmz_date.tm_hour = dt.hour;
	zipfi.tmz_date.tm_min = dt.minute;
	zipfi.tmz_date.tm_sec = dt.second;
	zipfi.dosDate = 0;
	zipfi.external_fa = 0;
	zipfi.internal_fa = 0;
	return zipfi;
}
Vector<EditorExportPlatformAndroid::ABI> EditorExportPlatformAndroid::get_abis() {