(Initial) Functionality wishlist + discussion

[metachris]

Braindump for a wishlist of functionality:

• setFeeRecipient, to allow clients building only for a specific validator (see also Simplify spec, update based on recent discussions #82)
• polling (with short or no delay), with the relays handling
• streaming of headers from relay to mev-boost

sequenceDiagram
    participant consensus
    participant mev_boost
    participant relays

    Note over consensus: startup
    consensus->>+mev_boost: builder_setFeeRecipientV1
    mev_boost->>relays: relay_setFeeRecipientV1    

    Note over mev_boost: poll relays always
    mev_boost->>relays: relay_getPayloadHeaders
    relays-->>mev_boost: return headers for all possible forks

    Note over mev_boost: start a push subscription
    mev_boost->>relays: relay_subscribePayloadHeaders
    relays-->>mev_boost: stream new headers as they get build

    Note over consensus: wait for allocated slot
    consensus->>+mev_boost: builder_getPayloadHeaderV1

    Note over mev_boost: select most valuable cached payload
    mev_boost-->>-consensus: builder_getPayloadHeaderV1 response

    Note over consensus: sign the block
    consensus->>+mev_boost: builder_proposeBlindedBlockV1

    Note over mev_boost: identify payload source
    mev_boost->>relays: relay_proposeBlindedBlockV1

    Note over relays: validate signature
    relays-->>mev_boost: relay_proposeBlindedBlockV1 response
    mev_boost-->>-consensus: builder_proposeBlindedBlockV1 response

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ping @jparyani @lightclient @terencechain @ElOpio