Grinkers / clojure-reader / 23678819341

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Reduce allocations in serializer and deserializer.

Benchmarks: serialize -33.9%, deserialize -4.5%.

Replace `to_string()` + string concatenation with `write_fmt` for numeric serialization, eliminating
a temporary String allocation per number. Pre-allocate output buffer capacity in the serializer and
use length hints from serde for seq/map/struct serialization.  In the deserializer, rework MapEdn to
own its BTreeMap and use a pending_value field instead of cloning keys on peek. Change EnumEdn to
hold an owned Edn instead of a reference, removing tree clones.

36 of 38 new or added lines in 2 files covered. (94.74%)

1407 of 1417 relevant lines covered (99.29%)

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