Add support for multiple extractor types (eBPF, P2P, and RPC)

[Davidhsb]

Added support for running all three peer-observer extractor types via Docker Compose.

What's Changed:

• Added EXTRACTOR_TYPE environment variable to switch between extractors:

  • ebpf (default): Kernel-level monitoring
  • p2p: Acts as a Bitcoin P2P peer
  • rpc: Queries Bitcoin Core RPC periodically

• Enhanced entrypoint script to handle different extractor startup logic

• Added configuration options for each extractor type

• Updated documentation with usage examples

[m4ycon]

@Davidhsb I'll review this sometime, but I have a question, your description says:

Added EXTRACTOR_TYPE environment variable to switch between extractors:

Wouldn't be interesting to run multiple extractors at once? What do you think about it? Would it be hard to implement something like that?