Add batching configuration options

[w0l4i]

Added new configuration o## Overview
This PR addresses the performance bottlenecks identified in issue #263. As discussed, it moves hardcoded constants related to batching and timeouts into the configuration file.

Changes

• Added batch_timeout_ms to config (default: 10000ms).
• Added batch_coalesce_window_ms to config (default: 8ms).
• Added max_batch_ops to config (default: 50).ptions for batching with defaults. ## Impact
  Users in high-latency environments (like GAS relays) can now tune these parameters to prevent long-tail blocking and improve tunnel responsiveness.

[therealaleph]

Closing in favour of #269 — same intent but #269 also wires the values through tunnel_client.rs (this PR adds the config fields without a consumer). Don't take this as a decline of the work — the field shape (batch_timeout_ms, batch_coalesce_window_ms, max_batch_ops with serde defaults) is the right call. See my comment on #269 for the next step.

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_{[reply via Anthropic Claude | reviewed by @therealaleph]}

[w0l4i]

i will wait for your turn , I'm sorry without good internet i can't run test build and this happened please do according to the plan by yourself #263

Closing in favour of #269 — same intent but #269 also wires the values through tunnel_client.rs (this PR adds the config fields without a consumer). Don't take this as a decline of the work — the field shape (batch_timeout_ms, batch_coalesce_window_ms, max_batch_ops with serde defaults) is the right call. See my comment on #269 for the next step.

[reply via Anthropic Claude | reviewed by @therealaleph]