feat: allow lenient mode for connection properties #671
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Some applications automatically add additional properties to connection strings that are unknown to the Spanner Connection API (and thereby also the Spanner JDBC driver). This causes the connection attempt to fail. This change allows a user to specify 'lenient' mode where unknown properties only generate a warning instead of an error.
Needed for dropwizard/dropwizard#3461
Needed for googleapis/google-cloud-java#6671
Needed for googleapis/java-spanner-jdbc#283