feat: routerVendor variable [OTE-351]

[yogurtandjam]

this PR:

• adds routerVendor variable to determine whether to use squid or skip
• creates useSkip input param for perpetual state machine. this isn't ideal, but it's okay because:
  • we'll be removing this code fairly soon anyway
  • we can't pass in the routerVendor variable all the way in because there's a different enum for V2 and V1 abacus
• updates base router interface to use new internal state properties
• updates all references to squidProcess -> routerProcessor
• adds tests to ensure that tradingstatemachine constructs the correct processor
• defaults to using Squid
• does NOT use the useSkip variable yet to branch squid vs skip codepaths in the StateAdaptor. This is because we can't reliably test that code branching yet.

NOTE: i'd really like to add mockk so we can test that the OnboardingSupervisor is calling the correct methods for squid vs skip branching so I can feel really confident about the branching logic for what API to call

that will be a followup PR to this.

[linear]

OTE-351 [abacus] routerVersion env flag

[rosepuppy]

Nice!