Add support for RSA SecurID MFA software tokens

[gc-eh]

Description

Add support for RSA SecurID virtual MFA tokens https://www.rsa.com/products/securid/

Preferred Solution

Expose serial number & seed of the virtual token. The seed allows to duplicate the token, then bypass MFA, thus proves the leak. The serial number allows an admin to invalidate the token.

Additional Context

Custom detection logic:

detectors:
- name: RSASecurIDDetector
  keywords:
  - TKNHeader
  regex:
    SerialNumber: |-
      <SN>\d+?</SN>
    Seed: |-
      <Seed>.+?</Seed>
  primary_regex_name: SerialNumber

References

Example tokens available at https://github.com/stoken-dev/stoken