DRAFT: Reduce buffer size of unused side of socket

[gregcusack]

Problem

We allocate large send and receive buffers for all sockets. However, not all sockets read and write to/from the buffers. In fact, 6 sockets are Read Only and 2 are Write Only. Meaning we are allocating memory that is never used.

Summary of Changes

1. Reduce buffer sizes for the unused side of sockets down to 4 MB
2. Update SocketConfig to use builder pattern
3. Deprecate unused net-utils methods that use default SocketConfig

NOTE: i got rid of the default "bind" methods in net-utils/lib.rs so that developers are intentional about their socket allocations.

Services/Sockets
Read/Write

1. Gossip
2. RPC - TCP
3. Ip_echo - TCP
4. Tvu
5. tvu_quic
6. Repair
7. Repair_quic
8. Serve_repair
9. Serve_repair_quic
10. Ancestor_hashes_requests_quic
11. Ancestor_hashes_requests

Read Only

1. Tpu
2. Tpu_forwards
3. Tpu_vote
4. Tpu_quic
5. Tpu_forwards_quic
6. Tpu_vote_quic

Write Only

1. Retransmitter
2. Broadcast

Follow Up PR:

1. Make better sizing decisions for the sockets that don't need a full 128MB buffer