Add Ether-S-Bus protocol dissector

[0xA50C1A1]

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• I have signed the ntop Contributor License Agreement at https://github.com/ntop/legal/blob/main/individual-contributor-licence-agreement.md
• I have read the contributing guide lines at https://github.com/ntop/nDPI/blob/dev/CONTRIBUTING.md
• I have updated the documentation (in doc/) to reflect the changes made (if applicable)

Describe changes:

Ether-S-Bus is a proprietary Saia-Burgess Controls protocol used by their PLCs together with Ether-S-I/O.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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[IvanNardi]

Thanks!