[Rpc] Buffer invocations if host detects file system changes that would initiate langauge worker process restart rapidly

Related to https://github.com/Azure/azure-functions-host/issues/7462

Follow up from a CRI investigation - Long Term fix

1. Customer updated files from portal
2. JobHost restart kicked off due to file changes
3. Java language worker process was restarted multiple times - each jobhost restart will initiate language worker process restart

Invocations that started before language worker process fully initialized failed with `Did not find any initialized language workers` error.

This is a race condition where invocations are dispatched even though langauge worker process is not initialized.

cc @AnatoliB @alrod @ConnorMcMahon

Start with the related issue #7462 and the CRI investigation described here, then trace how host file changes restart the language worker and how invocations are dispatched during initialization. Done means invocations are buffered during rapid restarts and no longer fail with "Did not find any initialized language workers."

Written by the indexing model from the issue text.