nwaku binaries name change

[jm-clius]

Problem

The nim-waku repo and project has recently been renamed to nwaku.
However, the binaries compiled from the repo still use a naming scheme where nwaku is never mentioned.
Examples of binaries compiled from the nwaku repo:

• wakunode1
• wakunode2
• chat2
• wakubridge
• sim2
  etc.

This may be confusing, e.g. when:

• any of the binaries are published as a standalone
• a binary is embedded as a service node in another application
• from a marketing perspective

Proposal

This issue proposes that we rethink the binary naming scheme, preferably adopting a scheme similar to nimbus-eth2 for organisational consistency.