fix(build): fix build fail on rust 1.61

since 1.61 rust has added a whole-archive modifier for link targets which is unset by default.

Previously to this version this was probably undefined behavior, because the linking would work fine when building an executable (like picodata) but would fail with undefined symbols when building a static library.

But now with the advent of this option, we can probably refactor picodata into a library which can be useful for testing, i.e. we can exclude testing stuff from the binary but still have a test binary with all the necessary runtime symbols.

Closes #81 (closed)