internal/ethapi: add eth_SendRawTransactionSync #32830
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aodhgan requested review from fjl, s1na, lightclient and rjl493456442 as code owners aodhgan changed the title 
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New RPC method eth_sendRawTransactionSync(rawTx, timeoutMs?) that submits a signed tx and blocks until a receipt is available or a timeout elapses.
Two CLI flags to tune server-side limits:
--rpc.txsync.default (default wait window)
--rpc.txsync.max (upper bound; requests are clamped)
Event-driven approach: subscribe to chain head events and re-check receipt on each new head.
Adds a short “settle” cycle after each head to bridge indexing lag; interval derived from the effective timeout (timeout/20, clamped to [25ms, 500ms]).
Success/timeout unit tests added.
closes #32094