CidEncodingException hide in cast() method

[crick77]

CidEncodingException "hided" at line 150-156. The catch clause does not have CidEncodingException as primary exception so java.lang.Exception will catch and hide the first throw.

should change at line 156 from

catch(Exception e) { ...

with

catch(CidEncodingException cee) { // capture and rethrow
throw cee;
}
catch(Exception e) { ... // everything else
`

so in calling method we can distinguish about the two causes.

[crick77]

Now running with pull-request modification the base exception seems to be missing Libp2p-key codec, code 0x72. I've added it to the enum and now works.