Add blake3 support

Start with Multihash.Type.lookup and Multihash.deserialize, then follow the failure through Cid.cast, Cid.decode, and MerkleNode.fromJSON. Verify the AddArgs example using blake3 no longer raises the unknown multihash type exception and that the resulting CID is accepted.

var args = AddArgs.Builder.newInstance().setCidVersion(1).setHash("blake3").build();
ipfs.add(namedStreamable, args);

causes:

Invalid cid bytes: 01551e20623a5460d841b6d1c13d080e85500e0043fd4ba4a8ba9c1aa9b4f6e0d212276c
io.ipfs.cid.Cid$CidEncodingException: 
	at io.ipfs.cid.Cid.cast(Cid.java:188)
	at io.ipfs.cid.Cid.decode(Cid.java:168)
	at io.ipfs.api.MerkleNode.<init>(MerkleNode.java:27)
	at io.ipfs.api.MerkleNode.fromJSON(MerkleNode.java:85)
	at io.ipfs.api.IPFS.lambda$add$1(IPFS.java:161)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
	at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1708)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
	at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682)
	at io.ipfs.api.IPFS.add(IPFS.java:162)
	at io.ipfs.api.IPFS.add(IPFS.java:148)
	at dev.enola.cas.IPFSBlobStore.store(IPFSBlobStore.java:53)
	at dev.enola.cas.IPFSBlobStoreTest.storeHello(IPFSBlobStoreTest.java:61)
Caused by: java.lang.IllegalStateException: Unknown Multihash type: 0x1e
	at io.ipfs.multihash.Multihash$Type.lookup(Multihash.java:147)
	at io.ipfs.multihash.Multihash.deserialize(Multihash.java:208)
	at io.ipfs.cid.Cid.cast(Cid.java:182)

I'll raise a PR once my other older pending PRs have been reviewed and merged... 😆