Cross database type_{X} macros

[dbeatty10]

Description & motivation

Resolves #1644

To-do before merge

• Ensure Move data type macros into dbt-core dbt-core#5428 is merged
• Ensure Use built-in adapter functionality for datatypes dbt-utils#586 is merged

Prerelease docs

If this change is related to functionality in a prerelease version of dbt (delete if not applicable):

• I've added versioning components, as described in "Versioning Docs"
• I've added a note to the prerelease version's Migration Guide

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[dataders]

a few questions:

1. is it worth having a sidebar entry for each of the newly added macros, even if they just link to subheading on this page? It's a non-blocking issue, but my gut tells me the sidebar could be more helpful? Perhaps @gwenwindflower has some incremental guidance for us...

2. what is the intent behind the "SQL Expressions" section at the bottom is it linked from elsewhere?

[dbeatty10]

1. is it worth having a sidebar entry for each of the newly added macros?

I'm not sure 🤷 Definitely interested in any feedback and ideas from you, @gwenwindflower, and others.

2. what is the intent behind the "SQL Expressions" section at the bottom is it linked from elsewhere?

Yep, it is linked many, many times right now since expressions are a little tricky to explain and understand:

Example:

• 

Were you thinking it should live (or link) somewhere else?

[dataders]

Were you thinking it should live (or link) somewhere else?

perhaps a standalone page? idc

[dbeatty10]

@dataders I merged this to get it out the door prior to the release candidate. But definitely feel free to re-organize by moving that section to a stand-alone page somewhere.