Fix SSE event names for block update stream

[jwiegley]

Summary

• Fixed inconsistent SSE event naming where block update stream was sending events named "BlockHeader" instead of "Block"
• Header update stream correctly continues to send "BlockHeader" events
• Aligns implementation with OpenAPI documentation

Problem

The SSE (Server-Sent Events) implementation had an inconsistency:

• Header update stream (/header/updates): Correctly sent events named "BlockHeader"
• Block update stream (/block/updates): Incorrectly sent events also named "BlockHeader"
• OpenAPI documentation specified block stream events should be named "Block"

Solution

Modified blockStreamHandler in src/Chainweb/BlockHeaderDB/RestAPI/Server.hs to dynamically set event names based on the withPayloads parameter:

• When withPayloads is true (block stream): events are named "Block"
• When withPayloads is false (header stream): events are named "BlockHeader"

Testing

• Build successful: cabal build chainweb
• BlockHeaderDB tests pass
• RestAPI tests pass
• No breaking changes introduced

Changes

• Modified event name generation in blockStreamHandler function
• Single file changed: src/Chainweb/BlockHeaderDB/RestAPI/Server.hs

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