Create or turn on an analyzer to check that we should always use invariant culture in deserialization/serialization

Follow up for this issue: https://github.com/Azure/azure-sdk-for-net/issues/43116

Sometimes we are creating customized serialization methods for some properties, and we should always be using the invariant culture when doing that.

Start by reading the linked follow-up issue #43116 and locate the analyzer projects or configuration in this tools repository. Determine which customized serialization and deserialization methods need invariant-culture checks, then verify that the analyzer reports those cases and is enabled for the intended SDK code.

Written by the indexing model from the issue text.