fix: snapshots failing because of wrong mysql colum quoting

[outinim]

Description

When I do snapshots on a table on which i add columns: it use the function (if I read correctly the file dbt/include/mariadb/macros/materializations/snapshot/snapshot.sql) {% do create_columns(target_relation, missing_columns) %}
which compiles into (for my source table users with a new column team) into
alter table sandbox.users_snapshot add column "team" varchar(10);
But it needs to be add column team to work in mysql

Checklist

• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• I have updated the CHANGELOG.md with information about my change

[mwallace582]

Made some comments, hopefully they're helpful. It'd would also be great if you'd be able to add a unit test for this new functionality.

[outinim]

Something like this is better ? Thanks for the reviews guys

[mwallace582]

This change (and the others like it) is not necessary. The create_columns() macro will automatically call the adapter's specific macro if one exists (which it now does).

[mwallace582]

I've made this change myself so that we can get this merged.

[mwallace582]

Sorry for the delay in taking a look at your changes. This is looking a lot better, and I've just got the one new comment.

It'd also be great if you'd be able to add some tests around this, although I'd be willing to merge this without them given the small scope of the changes.