Update event-schema-blob-storage.md

[Ankit-MSFT]

Added information for accessTier and previousTier fields in Cloud Event and Event Grid schemas, as these properties are available in SetBlobTier changed event.

Sample json messages showing availability of these fields:

Event grid schema based event data showing both the new fields:

Event grid schema based event data showing accessTier field as the blob had inferred data:

Cloud event schema based event data showing both the new fields:

Cloud event schema based event data showing accessTier field as the blob had inferred data:

The StorageBlobTierChangedEventData class in EventGrid .Net SDK already contains properties for these two fields: https://learn.microsoft.com/en-us/dotnet/api/azure.messaging.eventgrid.systemevents.storageblobtierchangedeventdata?view=azure-dotnet#properties

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[ShannonLeavitt]

@spelluru

Can you review the proposed changes?

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[spelluru]

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