CAMEL-18962: encryption and signature handling with server config

[jonomorris]

Description

When the AS2 server is configured with a decryption key all received messages will require encryption, and only messages with valid encryption will be successfully processed. Similarly, when the AS2 server is configured with a message signature validation certificate chain all received messages will require a signature.

Only messages with valid encryption or signature configured as required will be successfully processed otherwise the server will return an 'insufficient-message-security' error disposition [1].

Additionally messages that cannot be decrypted will return a 'decryption-failed' error, and messages failing signature validation will return an 'authentication-failed' error [2].

[1] https://datatracker.ietf.org/doc/html/rfc4130#section-7.4.3
[2] https://datatracker.ietf.org/doc/html/rfc4130#section-7.5.4

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[jonomorris]

/component-test as2

Result ✅ The tests passed successfully

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