Feature/multi forwarding filter

[voluntas]

This pull request includes several changes to enhance the signaling and data channel messaging functionalities in the SDK. The most important changes include adding new types and fields for forwarding filters, updating the CHANGES.md file, and modifying the createSignalingMessage function to handle these new fields.

Enhancements to Signaling and Data Channel Messaging:

• packages/sdk/src/types.ts: Added new types ForwardingFilterRuleField, ForwardingFilterRuleOperator, ForwardingFilterRuleKindValue, ForwardingFilterRule, ForwardingFilterAction, and ForwardingFilter. Updated the ConnectionOptions and SignalingConnectMessage types to include forwardingFilters and marked forwardingFilter as deprecated. [1] [2] [3]

Documentation Updates:

• CHANGES.md: Updated to reflect the addition of forwarding_filters to signaling items and the new header items for DataChannel messaging.

Codebase Modifications:

• packages/sdk/src/utils.ts: Modified the createSignalingMessage function to include the new forwarding_filters field when present.