Deprecate encryption methods and make eciespy dependency optional

[MHHukiewitz]

eciespy is not actively maintained anymore and may cause problems when installed alongside newer versions of web3py and ethereum-related packages.

The solution makes installing eciespy optional, deprecates the Account.encrypt() and .decrypt() functions and will move them in future to their own aleph.sdk.encryption module.

[github-actions]

• New Dependencies: eciespy is a new dependency introduced which could introduce compatibility issues with other parts of the codebase or external libraries.
• Deprecated Methods: The encrypt and decrypt methods in common.py file are deprecated and will be moved to their own modules, this could potentially break existing uses of these methods.
• Potential Breaking Changes: There might be breaking changes introduced by the new dependencies or modifications to the codebase that may affect other parts of the system.

Consideration for reviewers should include understanding the impact on the codebase and ensuring that any potential issues are addressed before merging this PR. Only experienced developers should review 'BLACK' PRs, and the label should be used sparingly if possible.

# Example of how to use the CRC in a Python script
import subprocess

def categorize_pr(repo_name, description, rules, diff):
    user_message = f"""--- {repo_name} ---\n{description}\n\nRules: {rules}\n\nDiff:\n{diff}"""
    
    process = subprocess.run(['crc', '--input', '-'], input=user_message, text=True, capture_output=True)
    
    return process.stdout.strip()

repo_name = "aleph-im/aleph-sdk-python"
description = "Python SDK library for the Aleph.im network"
rules = ""
diff = """# Diff content here"""

print(categorize_pr(repo_name, description, rules, diff))

This script will run the CRC and print its output. The --input flag is used to pass the user message directly to the subprocess.