Project Settings: Implement getting project settings on C# ParatextProjectDataProvider

[tjcouch-sil]

As an extension developer, I want to be able to access Paratext-related project settings like books present on the PAPI so I can develop effectively.

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Implement getSetting, setSetting, and resetSetting on the C# ParatextProjectDataProvider. See #509 for details on these functions. They must call papi.projectSettings.isValid and papi.projectSettings.getDefault appropriately.

Depends on #509, #57

[roopa0222]

Test Repo Steps:

1.On the web-view able used PAPI useProjectSettings hook to display Paratext project setting bookspresent.

const [projectParatextStandard] = useProjectSetting(
    'ParatextStandard',
    '32664DC3288A28DF2E2BB75DED887FC8F17A15FB',
    'platformScripture.booksPresent',
    '000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
  );

2.Confirmed that UI displayed the value from the setting.xml file from c-sharp/assets