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feat(market_data): add MarketDataBuilder::add_generic_tick (#521)

* feat(market_data): add MarketDataBuilder::add_generic_tick

New appender method complements the bulk generic_ticks(&[..]) setter for
incremental composition (chaining + conditional ticks). Also corrects the
generic_ticks doc-comment IDs against the IB tick-types page: 221 -> 232
for Mark Price; remove undocumented 256 (Inventory) and 258 (Fundamental
Ratios); add 292/318/375/456/588.

Tests use assert_request + market_data_request() so the encoded
generic_tick_list is verified end-to-end (sync append-only, sync
replace-then-append, async append-only).

* fix(docs): mark add_generic_tick example as ignore

The add_generic_tick doc-example sits in the generic impl<'a, C> block,
so its doctest is compiled under every feature config. Using
ibapi::client::blocking::Client (sync-only) broke the async-only CI
build. Switch no_run -> ignore so the example illustrates usage without
binding to a feature-gated Client. Sync/async-runnable forms remain on
the per-feature subscribe() impls.

* docs: drop ignored example, demonstrate add_generic_tick on subscribe

Removes the ignore-only example from add_generic_tick (which sat in the
generic impl<'a, C> block and couldn't bind to either Client without
breaking the other feature config). Both subscribe() doc examples now
chain add_generic_tick to demonstrate it; they're feature-gated so each
compiles cleanly under its own config. Matches the convention already
used by the file's other setters (no per-setter examples; canonical
example on subscribe).

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