major: object class name updates

[brodycj]

• update a test to test with object class name library API option ref: issue Object class name in library API not tested #336
• rename className to objectClassName in library API & update test case - BREAKING CHANGE
• add --object-class-name CLI option for objectClassName
• deprecate prefix option in CLI help test & documentation, which could be problematic due to issue inconsistency in object class name in case of lower-case prefix #337
• documentation updates
• update affected test snapshots

intended for upcoming 0.x release

TODO items - done:

• test use of the new CLI option with a generated example on Android & iOS
• cleanup: remove a now outdated comment about objectClassName & CLI in lib/normalized-options.js
• cleanup: combine destructuring of name & objectClassName options in lib/normalized-options.js
• add comment to lib/lib.js that prefix option is only needed for console log purposes in that module

[brodycj]

Tested generated native module with React Native 0.62 example on Android & iOS, as generated by the following command in my work area:

./bin/cli.js --object-class-name SuperModule --generate-example adamTestAlpha

Tested generated native view with React Native 0.62 example on Android, iOS, and tvOS, as generated by the following command in my work area:

./bin/cli.js --view --object-class-name SuperView --tvos-enabled --generate-example --example-react-native-version react-native@npm:react-native-tvos awesomeNativeView