fix(router): refactor complexity limits

[df-wg]

Motivation and Context

Previous work (#1153) added in the opportunity to limit allowed query depth, rejecting a query if it passes the acceptable limit. This PR moves that configuration into a newly created security.complexity_limitssection, while still maintaining the now deprecatedsecurity. depth_limit` section for the next 60 days

It will now be configured using:

security:
    block_mutations: false
    block_subscriptions: false
    block_non_persisted_operations: false
    complexity_calculation_cache: # This is for a local in-memory cache, to persist the calculation results
      enabled: true
      size: 1024
    complexity_limits:
        depth: # the equivalent of `security.depth_limit` prevoiusly
          enabled: false
          limit: 7
          ignore_persisted_operations: true
        total_fields:
          enabled: false
          limit: 128
          ignore_persisted_operations: true
        root_fields:
          enabled: false
          limit: 3
          ignore_persisted_operations: true
        root_field_aliases:
          enabled: false
          limit: 3
          ignore_persisted_operations: true

Checklist

• I have discussed my proposed changes in an issue and have received approval to proceed.
• I have followed the coding standards of the project.
• Tests or benchmarks have been added or updated.
• Documentation has been updated on https://github.com/wundergraph/cosmo-docs.
• I have read the Contributors Guide.

[StarpTech]

LGTM