feat: bump nim-libp2p to v2.0.0

[fcecin]

Description

NOTE: There is another libp2p v2.0.0 bump PR ongoing which we may prefer over this one (if so, we can close this one)

NOTE: This PR is WIP; do not merge:

• Must revert json_rpc + web3 pointing at a temp fork after we fix json_rpc websock semver constraint upstream;
• Need actual nim-libp2p v2.0.0 release, not a commit of working 2.0.0 release branch

EDIT: nim-json-rpc bump already on the way status-im/nim-json-rpc#277

This PR bumps nim-libp2p to v2.0.0, which paves the way for adding QUIC support in logos-delivery.

Changes

• DRAFT: route json_rpc + web3 through websock-relaxed forks (revert on upstream fix)
• bump nim-libp2p pin to release/v2.0.0 (c43199378)
• add libp2p_mix dep; repoint libp2p/protocols/mix -> libp2p_mix
• pin nimble.lock: lsquic / websock / boringssl / protobuf_serialization / npeg / jwt
• migrate rng ref HmacDrbgContext -> libp2p Rng across prod/channels/noise/tests (interface-only; same DRBG)
• noise: params take Rng, extract bearSslDrbg internally
• waku_switch: TransportConfig factory; unified 2.0.0 connection limits (withMaxInOut, withMaxConnections); local MaxConnections
• waku_relay/rendezvous/discv5/kademlia: v2.0.0 API (rng, config, ServiceDiscovery rename)
• call Service.setup() on post-build switch services (2.0.0 split setup/start, fixes autonat addressMapper nil-deref segfault)
• drop libp2p/utils/semaphore -> chronos AsyncSemaphore
• add waku/compat/option_valueor shim (Option[T] valueOr/withValue, dropped upstream)
• add std/options where a transitive re-export was removed
• add newStandardSwitch shim (libp2p removed it in 2.0.0); mounts yamux+mplex to match prod muxer
• PeerId.random(rng); common.rng()/crypto.newRng(); hoist shared rng (instantiation cleanup)
• update expectations for 2.0.0 defaults: DEFAULT_PROTOCOLS += /ipfs/id/push/1.0.0; agent "nim-libp2p"
• drop relay reboot/reconnect test (asserted a Switch restart capability that is simply not supported)

Issue

iterates logos-messaging/pm#404

iterates logos-messaging/pm#324

[github-actions]

This PR may contain changes to database schema of one of the drivers.

If you are introducing any changes to the schema, make sure the upgrade from the latest release to this change passes without any errors/issues.

Please make sure the label release-notes is added to make sure upgrade instructions properly highlight this change.

[github-actions]

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quay.io/wakuorg/nwaku-pr:3929

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