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realtime: TickByTickBuilder replaces tick_by_tick_* quartet (#618)

* realtime: TickByTickBuilder replaces tick_by_tick_* quartet

Collapse the four near-identical `tick_by_tick_{all_last,last,bid_ask,midpoint}`
methods (sync + async) into one `client.tick_by_tick(&c, n)` builder entry
with `.last()` / `.all_last()` / `.bid_ask(IgnoreSize)` / `.mid_point()`
terminals. The `ignore_size: bool` arg — only meaningful for BidAsk per
IBKR — becomes an `IgnoreSize` enum on that terminal alone.

Shared `pub(crate) fn tick_by_tick<T: StreamDecoder<T>>` helpers in
realtime/sync and realtime/async deduplicate the wire encoding +
validate_tick_by_tick_request path.

Mirrors the HistoricalTicksBuilder shape established in #613.

* realtime: /simplify cleanup for TickByTickBuilder

- Add `# Examples` block to async `Client::tick_by_tick` entry to match the
  sync sibling (per-method sync/async doc pairing).
- Inline `let ignore_size = false;` test bindings — the variable lost its
  call-site after the builder migration; only consumer is `.ignore_size(...)`
  in the assert, which now takes the literal directly. 8 sites.
- Sync doc-examples: `subscription.iter()` yields
  `Result<SubscriptionItem<T>, Error>`, not `T` — printing as `{x:?}` would
  show the wrapped form. Switch to `.iter_data()` + match on the result,
  which yields `Result<T, Error>`. Covers the 4 new tick_by_tick terminals,
  the entry-point examples in sync/mod.rs (tick_by_tick + realtime_bars),
  and the touched bars.rs `RealtimeBarsBuilder::subscribe` example.

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