An upper limit check of SPV clients count is required.

[chaoticlonghair]

Issue

Currently, there only exists a lower limit check of SPV clients count.
https://github.com/ckb-cell/ckb-bitcoin-spv-contracts/blob/09b90c61059fc5870154be0722db10daa6650b0c/contracts/ckb-bitcoin-spv-type-lock/src/operations/create.rs#L13-L15

To avoid unexpected errors, an upper limit check is required.

I propose 250 as the upper limit.

Ref: Description in the document.