Support hikari data-source-properties in ContainerDatabaseDriver

I tried to use test containers with hikari data-source-properties in Spring Boot like this:

spring:
  datasource:
    driver-class-name: org.testcontainers.jdbc.ContainerDatabaseDriver
    url: jdbc:tc:mysql:5.7.22://testcontainers/hi_perf_java_pers #?rewriteBatchedStatements=true&profileSQL=true&logger=com.mysql.cj.log.Slf4JLogger
    hikari:
      data-source-properties:
        rewriteBatchedStatements: true
        profileSQL: true
        logger: com.mysql.cj.log.Slf4JLogger

But datasource properties are ignored by connect method inside ContainerDatabaseDriver (info parameter in method connect).

Workaround so far is to include properties directly into connection string (commented part in url #?rewriteBatched...).

MySQL driver is doing it in this way:

/**
     * Builds a connection URL cache map key based on the connection string itself plus the string representation of the given connection properties.
     * 
     * @param connString
     *            the connection string
     * @param info
     *            the connection arguments map
     * @return a connection string cache map key
     */
    private static String buildConnectionStringCacheKey(String connString, Properties info) {
        StringBuilder sbKey = new StringBuilder(connString);
        sbKey.append("\u00A7"); // Section sign.
        sbKey.append(
                info == null ? null : info.stringPropertyNames().stream().map(k -> k + "=" + info.getProperty(k)).collect(Collectors.joining(", ", "{", "}")));
        return sbKey.toString();
    }

Start at ContainerDatabaseDriver.connect and inspect how its info parameter is handled when creating the database connection. Compare that behavior with the MySQL driver's use of connection properties, using the Spring Boot Hikari configuration in the issue as the reproduction case. Done means hikari data-source-properties reach the underlying connection without requiring them in the JDBC URL.