feat(funding) Add defaultFunding8hrPpm field to Perpetual Create/Update indexer events

[teddyding]

CT-1340

Changelist

• Database migration to add DefaultFundingRate1H
• In PerpetualMarketCreateEvent and UpdatePerpetualEvent, add DefaultFunding8hrPpm. In handlers, convert these ppm into 1hr funding rate and store in DB.

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[Describe how this PR was tested (if applicable)]

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[linear]

CT-1340 Handle non-zero `DefaultFunding` in indexer

[teddyding]

Note: Instead of Harry's approach which creates a new V2 message type, simply add the field which is non-breaking. The event handler just needs handle the case when the field is absent.