feat: define a maxLength limit for varchar at the connector level

[pnadolny13]

Originally raised in slack https://meltano.slack.com/archives/C01TCRBBJD7/p1688652938423919

The meltanolabs target-snowflake was throwing an error because its accepting the max length 4294967295 from the schema message as the varchar length which is larger than what snowflake accepts 16777216. It looks like currently we just pass that value through to sqlalchemy with no validation to limit it from being too large and ultimately the DDL fails.

I'm going to fix it in target-snowflake but it does feel like something that should be handled by the SDK because its going to be relevant for most ever target. If we had a property method that needed to be implemented or a default class property that could be overridden. Another thing that might be worth checking out is if the sqlalchemy dialect package could tell us this generically somehow.

[pnadolny13]

This was solved in target-snowflake in MeltanoLabs/target-snowflake#68. That has some logic specific to target-snowflake so using something like Edgar suggested in MeltanoLabs/target-snowflake#68 (comment) would probably be best for the SDK.

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[edgarrmondragon]

We'll be able to do this once #2618 is in

That's not it, since that's for taps. This is for targets, and a little more involved so punting to a later milestone.