Update and apply naming conventions to CLI

[fhildeb]

This PR standardizes names and terms related to nodes and the LUKSO Blockchain as stated from Fabian in Discord

• Node is only used or correlated to situations where all clients are working together

• Regarding processes, the single term client is used instead of node or node client

• Instead of the term node folder, working directory is used to address the node's data storage

• The term client is used instead of engine to describe node-related processes

• The term consensus client is used instead of beacon chain or beacon client

• Instead of LUKSO CLI Tool, the name LUKSO CLI is used, as the abbreviation covers its purpose already

• Instead of LUKSO network, the chain is referred as LUKSO Blockchain

[github-actions[bot]]

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