Parametrise RaptorQ config

[herr-seppia]

Describe what you want implemented
Initialisation config used by RaptorQ should be parametrised inside the peer builder

kadcast/src/transport/encoding/raptorq_encoder.rs

Lines 23 to 26 in a2ec7a3

	const DEFAULT_REPAIR_PACKETS_PER_BLOCK: u32 = 15;
	const MAX_CHUNK_SIZE: u16 = 1024;
	const CACHE_DEFAULT_TTL_SECS: u64 = 60;
	const CACHE_PRUNED_EVERY_SECS: u64 = 60 * 5;

Describe "Why" this is needed
This will allow to tune the library without recompile it

Describe alternatives you've considered
N/A

Additional context
N/A