Remove besu as a adapter

[kartikaysaxena]

Fixes #1529

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• [x ] A link to the issue/user story that the pull request relates to
• How to recreate the problem without the fix
• Design of the fix
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[davidkel]

@kartikaysaxena Sorry I think you have misunderstood the issue here. Caliper still supports besu, but it doesn't have a separate Connector (Adapter) to do so, it re-uses the ethereum one. In the caliper docs under contributing, also referred to as the developer documentation, it describes that a caliper-besu package exists in the source which it doesn't. This is what the issue is referring to. I've updated the issue to make it more clear.

[kartikaysaxena]

Sure @davidkel, I have taken in the suggestion and made changes accordingly to the issue in the v0.5.0 and vNext docs, I have created a continuation PR #1534, and closing this one.