added custom flattern

[tavasyag]

Fixes hashicorp/terraform-provider-google#28022

Fixes a perpetual drift on google_datastream_stream where binary_log_position {} in mysql_source_config caused a diff on every plan.
The Datastream API omits binaryLogPosition from GET responses, causing the provider to clear it from state on each refresh.

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datastream: fixed permadiff on `binary_log_position` in `google_datastream_stream`         

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes for commit 0e3d7e7:

Diff report

Your PR generated the following diffs in downstream repositories:

Repository	Diff Link	Changes
google provider	View Diff	1 file changed, 8 insertions(+), 4 deletions(-)
google-beta provider	View Diff	1 file changed, 8 insertions(+), 4 deletions(-)
terraform-google-conversion	View Diff	1 file changed, 8 insertions(+), 4 deletions(-)

Test report

Analytics

Total Tests	Passed	Skipped	Affected
20	10	10	0

Affected Service Packages

• datastream

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@tavasyag VCR tests complete for 0e3d7e7!

[tavasyag]

@modular-magician reassign-reviewer

[github-actions]

Googlers: For automatic test runs see go/terraform-auto-test-runs.

@SirGitsalot, a repository maintainer, has been assigned to review your changes. If you have not received review feedback within 2 business days, please leave a comment on this PR asking them to take a look.

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