esp32: Add "Free RAM" optimisation config flags.

This is necessary for ESP32-C2 Wi-Fi & BT to work reliably (and for TLS to
work at all). On IDF 5.4.2 the free static RAM goes from 60KB to 100KB, and
there will also be a reduction in lwIP & Wi-Fi memory use at runtime.

The performance trade-off seems low for most use cases, although it will
probably be significant for certain combinations of load (i.e. heavy
TCP/IP, heavy BT throughput, and some peripheral driver functions).

Added as a set of config flags because this is potentially useful on other
SoCs where the goal is to maximise RAM available for MicroPython.

This work was funded through GitHub Sponsors.

Signed-off-by: Angus Gratton <angus@redyak.com.au>

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