Bubble ID provider should support multiple types

[dnpotter]

At its heart, Bubble Protocol can be layered on top of any existing off-chain storage system, whether private server, cloud server, server cooperative, P2P network. Currently the provider field within a Bubble ID should supports a single url. This does not directly support cooperatives, P2P networks or other systems with multiple endpoints.

Consider adding a type field to the provider to allow for future expansion. E.g.:

const bubbleId = new ContentID({
    chain: 84531,
    contract: '0x22465eb700cd2629d0811208d428884b1de36fb5',
    provider: {
        type: 'url',
        url: 'https://vault.bubbleprotocol.com/v2/base-goerli'
    }
});

Alternatively use the provider's URI scheme to introduce new types.