tests(regression): add case for configs with huge numbers of certs

[jmayclin]

Problem:

Some customers run s2n-tls with massive number of certs, 10,000 +. It's difficult to intuitively understand performance for some of these cases.

Solution:

We should add a case in our regression tests to prevent any regressions on "per-cert" behaviors, since those are especially expensive for these customers.

Requirements / Acceptance Criteria:

case for

• configuration with 10,000 certs
• handshake with client sni for config with 10,000 certs