feat(cast): derive accounts from mnemonic

[leovct]

Closes #12676

MNEMONIC="code code code code code code code code code code code quality"
cast wallet derive "$MNEMONIC" --accounts 3 --insecure --json

will produce:

[
  {
    "address": "0x85dA99c8a7C2C95964c8EfD687E95E632Fc533D6",
    "private_key": "0x42b6e34dc21598a807dc19d7784c71b2a7a01f6480dc6f58258f78e539f1a1fa"
  },
  {
    "address": "0x125FB391bA829e0865963D3B91711610049a9e78",
    "private_key": "0x0903a9a721167e2abaa0a33553cbeb209dc9300d28e4e4d6d2fac2452f93e357"
  },
  {
    "address": "0x964ec59D0E05Db08440c822d7C588e63BBDE8c4e",
    "private_key": "0x6421222a9964cbe1b411191dcac1afda173ed99346c47302c6fe88f65d83583e"
  }
]

[leovct]

@zerosnacks would you mind re-triggering the failing job? I believe it failed because of an unrelated flaky test - thank you!

[zerosnacks]

lgtm! would you mind adding a test case for the text and json variants?