Support IntelliSense drift detection so new objects aren't marked as errors

[mpkarlo]

• SQL Operations Studio Version: sqlops 0.23.6 (8a3011756318a2ded1e6e84332230a2b2bf9c544, 2017-11-06T21:51:43.232Z)
• OS Version: Windows_NT x64 6.1.7601

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I noticed this when following along in the quickstart guides and tutorials. I database TutorialDB and the table dbo.Customers. Then I opened a new query editor to follow along and it would mark the table as an invalid object 'Invalid object name dbo.Customers.'.

Steps to Reproduce:

1. Open a query editor and create a table.
2. Open a new query editor and write a select statement for the table created in step 1.

[llali]

@KMelendez there's a command to refresh the intelliSense cache you can use. By default the cache doesn't get refreshed by database changes

[erickangMSFT]

@stevestein This is documentation item as well.