Add Massa blockchain namespace codecs

[peterjah]

Add 8 multicodec namespace entries for the https://massa.net blockchain ecosystem, using the 0xbX9910 range following the existing namespace convention.

What is Massa?

Massa is a Layer 1 blockchain featuring native decentralized web hosting (DeWeb) and decentralized messaging (Gossip):

• DeWeb allows deploying and serving websites directly on-chain, resolved via the Massa Name Service (MNS) or direcly from smart-contract addresses
  https://deweb.massa.network
• Gossip is a decentralized messaging protocol where participants are identified by unique Gossip IDs
  https://usegossip.massa.network/

Codecs added:

│ 0xb59910 │ massa │ Ecosystem identifier

│ 0xb59911 │ massa-mainnet │ Mainnet network identifier

│ 0xb59912 │ massa-buildnet │ Buildnet network identifier

│ 0xb59913 │ massa-deweb │ DeWeb feature identifier

│ 0xb59914 │ massa-gossip │ Gossip feature identifier

│ 0xb59915 │ massa-mns │ MNS name target

│ 0xb59916 │ massa-sc │ Smart-contract address target

│ 0xb59917 │ massa-gossip-id │ Gossip ID target

Motivation

These codecs enable ENSIP-7 compatible contenthash encoding for Massa resources, allowing standard resolution of DeWeb sites and Gossip identities through content-addressed URIs.

[vmx]

I think the gaps between the namespaces are meant for further additions to those projects.

I suggest you start the massa namespace at 0xb59910 just as you did, but then do the following things directly there after, i.e. from 0xb59911 to 0xb59921.

[vmx]

It's in a high range, so I don't see a reason to not accept it.