feat: cni refactor for swift v2

[jaer-tsun]

combining 4 CNI PRs from forked repo

Reason for Change:

CNI changes for Swift 2

• update contract when CNI RequestIPs from CNS to include

• MacAddress of secondary (multitenant) interface
• NICType to define whether the IP config is InfraNIC (existing scenarios) or DelegatedVMNIC (swift 2)
• SkipDefaultRoutes to specify which interface traffic will go through by default
• Routes to configure on interface

• refactor existing endpoint creation flow to support multiple 'EndpointInfo' which represents an interface and consolidate into 'endpoint' struct which maps to pod

• added SecondaryInterfaces to endpoint struct

• add SecondaryEndpointClient to configure secondary interface

Issue Fixed:

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• relevant PR labels added

Notes:

[jaer-tsun]

moved to #2330