Use the libspeexdsp resampler

AFAICT it runs a little slower? but it's fixed point, and has much
better understood audio characteristics.

lib/speexdsp/CMakeLists.txt

@@ -0,0 +1,13 @@
+# Copyright 2023 jacqueline <me@jacqueline.id.au>
+#
+# SPDX-License-Identifier: GPL-3.0-only
+idf_component_register(
+  SRCS libspeexdsp/buffer.c libspeexdsp/fftwrap.c libspeexdsp/filterbank.c
+libspeexdsp/jitter.c libspeexdsp/kiss_fft.c libspeexdsp/kiss_fftr.c
+libspeexdsp/mdf.c libspeexdsp/preprocess.c libspeexdsp/resample.c
+libspeexdsp/scal.c libspeexdsp/smallft.c
+  INCLUDE_DIRS "include"
+  PRIV_INCLUDE_DIRS "libspeexdsp"
+)
+
+target_compile_options(${COMPONENT_LIB} PRIVATE -DHAVE_CONFIG_H -Wno-shift-negative-value -Wno-unused-const-variable)