feat(alerts): Add slack alerts for task submission sender

[PatStiles]

Add slack alerts for task submission sender

Description

Detects error messages logged returned from when the task sender sends proofs and sends them as separate slack messages to the slack alerts channel.

To Test:

• start a local devnet
• Specify a PRIVATE_KEY and SENDER_ADDRESS in ./alerts/.env that does not have a batcher balance to trigger InsufficientBalance Errors
• execute the alert script via ./alerts/sender_with_alert.sh ./alerts/.env
  You should observe that the error messages printed in the slack alerts channel as follows:

Error submitting proof to devnet:  Batcher responded with insufficient balance

Type of change

Please delete options that are not relevant.

• New feature

Checklist

• “Hotfix” to testnet, everything else to staging
• Linked to Github Issue
• This change depends on code or research by an external entity
  • Acknowledgements were updated to give credit
• Unit tests added
• This change requires new documentation.
  • Documentation has been added/updated.
• This change is an Optimization
  • Benchmarks added/run
• Has a known issue
  • Link to the open issue addressing it
• If your PR changes the Operator compatibility (Ex: Upgrade prover versions)
  • This PR adds compatibility for operator for both versions and do not change batcher/docs/examples
  • This PR updates batcher and docs/examples to the newer version. This requires the operator are already updated to be compatible

[MarcosNicolau]

Code looks fine, testing slack notifications and I'll approve it.