Record host locale for locale switching in DynamoCore

[QilongTang]

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Purpose

Record host locale for locale switching in DynamoCore. This PR works hand in hand with https://github.com/DynamoDS/Dynamo/pull/14622

Declarations

Check these if you believe they are true

• [ ] The code base is in a better state after this PR
• [ ] Is documented according to the standards
• [ ] The level of testing this PR includes is appropriate
• [ ] User facing strings, if any, are extracted into *.resx files
• [ ] Snapshot of UI changes, if any.

Reviewers

FYIs

@DynamoDS/dynamo @Mikhinja

[QilongTang]

@Mikhinja this should be a safe change on DynamoRevit side since DefaultThreadCurrentCulture is not used in the code base currently. I will merge for now to unblock the testing on the Dynamo side. Appreciate it!