chore: support RLN-relay in libwaku

[Ivansete-status]

Background

Epic: #2420

Pre-requisite

The following should be completed before starting this so that we can benefit from having a single configuration entry to the waku_node: #2441

Details

Apply the needed changes in libwaku.nim and libwaku.h so that we bring support to RLN-relay there.

The mountRlnRelay should be invoked in

nwaku/library/waku_thread/inter_thread_communication/requests/node_lifecycle_request.nim

Line 193 in 2060cfa

when conf.rlnRelay == true.

In this case, we might need to allow accepting more config options in the JSON file. Example of how JSON config file is being passed:

nwaku/examples/cbindings/waku_example.c

Line 271 in 2060cfa

snprintf(jsonConfig, 2048, "{ \

Notice that is interesting to extend the cwaku_example so that we can test the new RLN-relay feature from there.

From a very high level, the libwaku node should also support these operations:

• appendRLNProof
• validateMessage