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feat(secure-channel): add transportFactory option to ClientSecureChannelLayerOptions

Follow-up to the IClientTransport / IClientTransportFactory /
defaultClientTransportFactory exports added in #<PR1>. Wires the factory
through ClientSecureChannelLayer so consumers can substitute the
transport implementation without forking node-opcua-secure-channel.

Purely additive: when transportFactory is omitted, behaviour is
byte-for-byte identical to before — the constructor falls back to
defaultClientTransportFactory, which calls new ClientTCP_transport(...)
exactly where it was called before.

Changes in client_secure_channel_layer.ts (~54 insertions, 10 deletions):

- Import rewrite: swap `ClientTCP_transport` for the factory+interface
  set from node-opcua-transport. ClientTCP_transport is no longer
  referenced in this file.
- New optional field on ClientSecureChannelLayerOptions:
  `transportFactory?: IClientTransportFactory`, with JSDoc covering the
  three use cases (browser WebSocket transport, test doubles, tracing
  wrappers).
- Private field `#transportFactory: IClientTransportFactory` stored in
  the constructor with `options.transportFactory ||
  defaultClientTransportFactory`.
- Type widening on two internal fields: `#_transport` and
  `#_pending_transport` are now `IClientTransport | undefined`.
- Construction site swap in #create:
  `new ClientTCP_transport(settings)` →
  `this.#transportFactory.create(settings)`. Debug-log string updated
  from "creating ClientTCP_transport" to "creating transport".
- `getTransport()` return type widens to `IClientTransport | undefined`
  with added JSDoc telling test callers that need `._socket` access to
  narrow with `as ClientTCP_transport`. Safe when built with the default
  factory.
- Four internal-method parameter types updated (`#_on_connection`,
  `#_backoff_completion`, `#_connect`, `#_establish_connection`): each
  `transport: ClientTCP_transport` → `transport: IClientTransport`.
  Pure type change... (continued)

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