fix(android): ensure rate is never set to 0

[freeboub]

Summary

• Add safety check to ensure rate is never set to 0 on android
• update and clarify documentation

Motivation

Fix: #3071

Changes

• documentation update
• add safety check on android
• add 0 playback speed in sample to test easily

Test plan

• press 0 playback speed in the sample

[KrzysztofMoch]

How about we add warning (on JS side) to don't confuse users ?

if(Platform.OS === 'android' && rate == 0) {
    console.warn('react-native-video: You should not set rate to 0 on Android');
}

[freeboub]

How about we add warning (on JS side) to don't confuse users ?

if(Platform.OS === 'android' && rate == 0) {
    console.warn('react-native-video: You should not set rate to 0 on Android');
}

@KrzysztofMoch It makes sense, but I don't see anywhere to put it easily and I don't want to add this test in each render ...
I fix the PR by adding a log on Java side and also fix the bad test (it was not working initially... )

[KrzysztofMoch]

Sure, LGTM 👍