fix direct memory leak bug

[hangc0276]

Fix #442

Modification

1. Add NPE check for peekOffsetFromEntry and peekBaseOffsetFromEntry
2. Auto skip fetched exception entry in decode stage to avoid direct memory leak.

[BewareMyPower]

Since it could be conflict with #556, I think you can wait until #556 is merged and fix this PR after that.

[jiazhai]

@hangc0276 Would you please help update with latest master code?

[hangc0276]

@hangc0276 Would you please help update with latest master code?

OK，I will update the code today.

[BewareMyPower]

Please fix the spotbugs check

Medium: Exception is caught when Exception is not thrown in io.streamnative.pulsar.handlers.kop.format.PulsarEntryFormatter.lambda$decode$3(ByteBuffer, byte, List, Entry) [io.streamnative.pulsar.handlers.kop.format.PulsarEntryFormatter] At PulsarEntryFormatter.java:[line 228] REC_CATCH_EXCEPTION

And it's better not to use throws Exception directly. Add a new exception type that derived from Exception.

[BewareMyPower]

I also noticed OffsetResetTest#testLessThanStartOffset is very easy to fail. If it's convenient, you can mark it as @Ignore in this PR so that we don't need a new PR to fix it. BTW, this test should not be passed now.

[hangc0276]

I also noticed OffsetResetTest#testLessThanStartOffset is very easy to fail. If it's convenient, you can mark it as @Ignore in this PR so that we don't need a new PR to fix it. BTW, this test should not be passed now.

@BewareMyPower I have update the code, PTAL, thanks.