MarcoFalke fa204100e1 streams: Remove confusing DataStream::in_avail() ...

The alias of the size() method is confusing, because:

* It claims to be part of the Bitcoin Core stream subset (streams
  interface), but this is not used by any other stream interface. Mostly
  the `write(std::span)` and `read(std::span)` define the stream
  interface.
* It casts the size_t to i32, but the only place that calls the function
  casts that back to size_t.
* Providing this alias for size() without a proper reason is confusing.

Fix all issues by removing it and using the size() method.

2026-04-24 12:46:03 +02:00

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