Breadcrumbs should use more efficient ringbuffer

[Swatinem]

Adding a breadcrumb right now is using sentry__value_append_bounded to limit the number of breadcrumbs according to settings:

sentry-native/src/sentry_core.c

Lines 650 to 651 in a05b260

	sentry__value_append_bounded(
	scope->breadcrumbs, breadcrumb, max_breadcrumbs);

However that internally does a costly memmove:

sentry-native/src/sentry_value.c

Line 658 in a05b260

memmove(l->items, l->items + to_shift, to_move * sizeof(l->items[0]));

It would be nice to find a way to optimize this, for example by using a ringbuffer / linked list, or some other method to avoid doing a O(n) memmove every time when adding breadcrumbs that are at their maximum.