Reducing Warnings - Misaligned Address of Over-Aligned Types (#1072)

* Enforce strict C99 conformance for debug-compile-aws
* Fix C99 standard conformance detection in link-sample-program scripts
* Add BSON_ALIGNOF
* Redefine BSON_ALIGN_OF_PTR in terms of BSON_ALIGNOF
* Add bson_aligned_alloc and bson_aligned_alloc0
* Add BSON_ALIGNED_ALLOC macro to avoid type repetition
* Add mongoc_array_aligned_init
* Fix alignment of allocated objects
* Add documentation for pool_node layout
* Add -fno-sanitize-recover=alignment to debug-compile-ubsan
* Add debug-compile-ubsan-with-extra-alignment