Add more logging coverage for all subtasks

[JatinSanghvi]

1. More coverage of all subtasks. Especially when we're doing SQL queries - we should have logging statements before and after each query ran.

e.g. https://github.com/Azure/azure-functions-sql-extension/blob/triggerbindings/src/TriggerBinding/SqlTriggerListener.cs#L189 and https://github.com/Azure/azure-functions-sql-extension/blob/triggerbindings/src/TriggerBinding/SqlTableChangeMonitor.cs#L195

2. Logging for each iteration of a loop and before each sleep (e.g. https://github.com/Azure/azure-functions-sql-extension/blob/triggerbindings/src/TriggerBinding/SqlTableChangeMonitor.cs#L159)

Originally posted by @Charles-Gagnon in #287 (comment)

3. Extra logging around any of the locking (include thread IDs if that isn't included by default)