[Sanitizer] Implement the accessors of SanitizerConfig.
This implements the data members and associated functions of SanitizerConfig.
It does not (yet) implement the actual sanitization logic, or handling
of defaults.
Bug: 356601280
Change-Id: Iba9f1f053a74f1420e60551b734c6321e4309596
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5981094
Reviewed-by: Yifan Luo lyf@chromium.org
Commit-Queue: Daniel Vogelheim vogelheim@chromium.org
Cr-Commit-Position: refs/heads/main@{#1378961}