[chronik] Electrum: gracefully error when the message is too big to be…
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Description

[chronik] Electrum: gracefully error when the message is too big to be serialized

Summary: Don't panic in this case.

Test Plan:
On terminal 1

ninja && ./src/bitcoind -debug=chronik -chronik -chronikscripthashindex -chronikelectrumbind="127.0.0.1:50001:t"

On terminal 2

echo '{"jsonrpc": "2.0", "method": "blockchain.scripthash.get_history", "params": ["44f2ccb974231cfc9d13e4badc782868e1248e8d6dbb202a3a3b854484628dd2"], "id": "test"}' | nc 127.0.0.1 50001 | jq

Check that terminal 1 does not print this message

thread 'tokio-runtime-worker' panicked at chronik/chronik-http/src/electrum_codec.rs:26:12:
range end index 15220560 out of range for slice of length 1048576
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Reproduced on master, fixed with this diff.

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Subscribers: PiRK

Differential Revision: https://reviews.bitcoinabc.org/D18114