feat: move ring buffer to use array instead of vec

[praveen-influx]

In this commit the vec backing the buffer is swapped for an array. Criterion benchmarks were added to compare the perf to make sure it has not made it worse. The vec implementation has been removed after the benchmarks done locally

[pauldix]

what was the delta in performance?

[praveen-influx]

what was the delta in performance?

Just looking at the mean, it was 40ms difference. This is artificial load (we may not read from the sys tables that frequently), but mainly indicates there's some gains. Think it'd be more interesting to see allocations, but I haven't managed to get through it yet (need a wrapper around jemallocator or some crate that does it).

syseventstore_writes_reads_t6/array/0
time: [3.4803 ms 54.879 ms 144.46 ms]

syseventstore_writes_reads_t6/vec/0
time: [40.278 ms 94.199 ms 160.97 ms]