[FEATURE]: Implement flocking algorithm example

[Evan Palmer]

Is your feature request related to a problem? Please describe

pymavswarm advertises the ability to be used for implementing decentralized swarm algorithms; however, there are no examples demonstrating how this could be implemented.

Describe the solution you'd like

Implement an example that can be executed on the companion computer of swarm agents that demonstrates a decentralized flocking behavior.

Describe alternatives you've considered

Alternatives could include a centralized swarm algorithm. In the future, both may be desirable.

Implementation Ideas

Implement a flocking algorithm as an example available in the examples/ directory. The example should be executable from an agent's companion computer (e.g., a Raspberry Pi 4), and demonstrate the ability to command multiple agents to flock to a location.

Additional context

Potential related works include the following:

• Algorithm for swarm robot flocking behavior