chore: enable conditional put by default for S3

[meteorgan]

Which issue does this PR close?

Closes #7080

Rationale for this change

What changes are included in this PR?

Are there any user-facing changes?

set S3ConditionalPut::ETagMatch as the default value for conditional_put in AmazonS3Builder

[tustvold]

One potential issue with the approach in this PR is I don't think there is a way now to turn off conditional put support, perhaps we need to add a Disabled variant?

[meteorgan]

One potential issue with the approach in this PR is I don't think there is a way now to turn off conditional put support, perhaps we need to add a Disabled variant?

Why and when would we need to disable conditional put ? and if it's disabled, what actions can we take ? Returning NotImplemented doesn't help.

[tustvold]

return NotImplemented doesn't help.

The scenario is an S3-compatible that doesn't support the headers, and simply ignores them, I could see people wanting to disable support so that they get an error instead of silently incorrect behaviour.

[meteorgan]

The scenario is an S3-compatible that doesn't support the headers, and simply ignores them, I could see people wanting to disable support so that they get an error instead of silently incorrect behaviour.

Ok, Let me add a Disabled variant to S3ConditionalPut.