[SIGNER BUG] Private key may get leaked to logs

[aryzing]

Describe the bug
If there's an error processing the private key, the key value gets logged,

stacks-core/stacks-signer/src/config.rs

Line 274 in 6f498f8

StacksPrivateKey::from_hex(&raw_data.stacks_private_key).map_err(|_| {

This isn't great, maybe there was a small typo like an extra space or accidental quotes around it which causes an error and gets leaked.

Steps To Reproduce
Set an invalid key value, and signer will log it when it starts.

Expected behavior
Perhaps a more generic error message that doesn't contain the key value: "Failed to parse private key, please check its value and try again."

[blockstack-devops]

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