Update BlacklistKeys and WhitelistKeys

[thompiler]

The technology industry has moved away from terms like whitelist/blacklist and master/slave in favor of options like allowlist/blocklist and main/replica.

• Replace use of whitelist with allowlist and blacklist with denylist rails/rails#33677
• Rename "blacklist" to "blocklist" and "whitelist" to "allowlist" airbrake-ruby#580
• https://twitter.com/leahculver/status/1269109776983547904

We should deprecate these outdated terms:

• BlacklistKeys https://github.com/airbrake/sharpbrake#blacklistkeys
• WhitelistKeys https://github.com/airbrake/sharpbrake#whitelistkeys

And replace them with allowlist/blocklist.