fix(cast): mktx: add missing --path argument for blob txs

[ryanschneider]

Motivation

After learning about mktx (see #8472 😅) I wanted to use it to create a blob tx, but received this error:

error: unexpected argument '--path' found

Or this error w/o --path:

Error:
server returned an error response: error code -32003: blob transaction missing blob hashes

Solution

I replicated the same missing logic from send in mktx. I also fixed the --path help showing up under Wallet options on both commands. I also considered moving path into TransactionOpts but that's used in enough other spots I assumed there was a good reason it wasn't there already.

Anyways, it works now:

> cargo run --bin cast -- mktx --private-key 0x59c6995e998f97a5a0044966f0945389dc9e86dae88c7a8412f4603b6b78690d 0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266 --blob --path <(echo "hello") | wc -c
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.79s
     Running `target/debug/cast mktx --private-key 0x59c6995e998f97a5a0044966f0945389dc9e86dae88c7a8412f4603b6b78690d 0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266 --blob --path /dev/fd/11`
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