Ion Writer max_container_depth Not Honored

[almann]

When investigating partiql/partiql-lang-rust#43, I noticed a couple of things. the max_container_depth option:

https://github.com/amzn/ion-c/blob/d63172996beb043cc06f8a626517eac40ea2699d/ionc/include/ionc/ion_writer.h#L66-L69

Is basically never used. Furthermore, the default of 10 can easily be overrun, and probably should be something a bit higher (I'd recommend making it 1024, as the cost is the container stack).