RFR: 8277954: Replace use of monitors with explicit locks in the JDK LDAP provider implementation

[Aleksei Efimov]

The change proposed in this PR improves the behavior of the JDK JNDI/LDAP provider when running in a virtual thread. Currently, when an LDAP operation is performed from a virtual thread context a pinned carrier thread is detected:

     Thread[#29,ForkJoinPool-1-worker-1,5,CarrierThreads]
        java.naming/com.sun.jndi.ldap.Connection.read reply(Connection.java:444) <== monitors:1
        java.naming/com.sun.jndi.ldap.LdapClient.ldapBind(LdapClient.java:369) <== monitors:1
        java.naming/com.sun.jndi.ldap.LdapClient.authenticate(LdapClient.java:196) <== monitors:1
        java.naming/com.sun.jndi.ldap.LdapCtx.connect(LdapCtx.java:2896) <== monitors:1

To fix that monitor usages are replaced with `j.u.c` locks. All synchronized blocks/methods have been replaced with locks even if it is only guarding memory access - the motivation behind such a decision was to avoid an analysis of scenarios where a mix of monitors and `j.u.c` locks is used.

There are three types of mechanical changes done in this PR:

1. Classes with `synchronized` blocks or `synchronized` methods have been updated to include a new `ReentrantLock` field. These new fields are used to replace `synchronized` blocks/methods.
1. classes that use notify/wait on object monitor have been updated to use `ReentrantLock.Condition`s signal/await.
1. if one class `synchronized` on an instance of another class - the `ReentrantLock` added in item (1) was made a package-protected to give access to another class.

With the proposed changes pinned carrier threads are no longer detected during execution of LDAP operations. 

Testing: `jdk-tier1` to `jdk-tier3`, other `jndi/ldap` regression and JCK naming tests show no failures.

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Commit messages:
 - revert incorrect changes in LdapCtx.addNamingListener, formatting and (c) updates
 - draft version

Changes: https://git.openjdk.org/jdk/pull/15526/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15526&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8277954
  Stats: 970 lines in 11 files changed: 394 ins; 101 del; 475 mod
  Patch: https://git.openjdk.org/jdk/pull/15526.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15526/head:pull/15526

PR: https://git.openjdk.org/jdk/pull/15526