Describe the bug

Currently, there are multiple separate licence options in Tauri Configuration. They should be clubbed into 1 or 2 option, with consistent naming.
Also, the name is also misleading. Current Situation:

1. PackageSettings : It has a license option and expects a string.
2. RpmSettings: It has license option as an alternate to PackageSettings
3. MacOsSettings: It has a license option, that is the path to the LICENSE file. However, it is taken as Option<String> instead of Option<PathBuf>
4. WixSettings: It also has a license option, which takes path to the LICENSE file, but uses Option<PathBuf>
5. NsisSettings: Similar to WixSettings.

So, it forms a bit chaos for bundling application.

Reproduction

No response

Expected behavior

1. The License should be clubbed into 1 universal option under package config.
2. license_file option should be used instead of license appropiately.

Full tauri info output

Latest Tauri dev branch

Stack trace

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Additional context

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