Adds more alerts for metrics

[maxneuvians]

Closes #204.

This PR adds some more alerts for metrics:

• UnauthorizedNewOneTimeCodeRequests alerts critical at 100 occurrences in 5 minutes.
• UnauthorizedOneTimeCodeClaimRequests alerts critical at 100 occurrences in 5 minutes.
• UnauthorizedUploadRequests alerts critical at 100 occurrences in 5 minutes.
• 500Response alerts critical after 10 occurrences in 1 minute.
• ErrorLogged alerts critical after 10 occurrences in 1 minute.
• UnclaimedOneTimeCodeTotal alerts warn after 250 keys found in the DB.
• UnclaimedOneTimeCodeTotal alerts critical after 400 keys found in the DB.
• ClaimedOneTimeCodeTotal alerts warn after 3000 keys found in the DB.
• ClaimedOneTimeCodeTotal alerts critical after 4500 keys found in the DB.
• DiagnosisKeyTotal alerts warn after 9000 keys found in the DB.
• DiagnosisKeyTotal alerts critical after 13500 keys found in the DB.

To note is that these are baseline values and can be tuned. The initial key calculations were from the total number of daily cases in Canada.