Add performance monitoring into data structures

[mgrosvenor]

There are a few ways of doing this.

1. It should be possible to compile them out.
2. Simple counters - Number of push, pop, resize ops etc.
3. Perf mon integration - time taken to do things. Should be added into unit tests if possible.

Idea - Could be generated with a macro that embeds types and a type/name string. This should allow the struct to be generically parsed and printed for nice program output.

make_stats(stats1, ch_word count1; ch_word count2; )

produces

struct {
ch_cstr* stats; //= "ch_word cont1; ch_word count2;"
ch_word count1; ch_word count2;
} stats1;

stats1.stats = "ch_word count1; ch_word_count2;";

which can then be generically interpreted later, by parsing the string.