Improvements for Correlation Logs

[lasanthaS]

Purpose

This PR includes,

• A new component to manage correlation logs
• Modifications to the CorrelationLogInterceptor class which used for JDBC related correlation logs
• Modifications to the RequestCorrelationIdValve class which used for HTTP related correlation logs
• • Modifications to the LDAPConnectionContext class which used for LDAP related correlation logs

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines? yes
• Ran FindSecurityBugs plugin and verified report? yes
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? yes

[lasanthaS]

@ruwanta FYI. This is the PR with Correlation log improvements for the 4.7.x branch.