[feat] Add IP Reservation support for Services backed by NodeBalancers

[hcwagner]

This PR is focused on adding support for IP Reservation while using NodeBalancers as a Service LoadBalancer. This assume that the customer has:

Reserved an IP through Linode CLI, CM, terraform, etc.
Supplies the reserved IP attached to their account through the provided Annotation

[codecov]

Codecov Report

❌ Patch coverage is 80.63492% with 61 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.06%. Comparing base (36df8ec) to head (35ad816).
⚠️ Report is 17 commits behind head on main.

Files with missing lines	Patch %	Lines
cloud/nodeipam/ipam/cloud_allocator.go	60.81%	24 Missing and 5 partials ⚠️
cloud/linode/route_controller.go	70.21%	12 Missing and 2 partials ⚠️
cloud/linode/cloud.go	72.00%	4 Missing and 3 partials ⚠️
cloud/linode/cilium_loadbalancers.go	68.75%	3 Missing and 2 partials ⚠️
cloud/linode/loadbalancers.go	94.02%	2 Missing and 2 partials ⚠️
cloud/linode/utils/common.go	91.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #437      +/-   ##
==========================================
- Coverage   72.17%   72.06%   -0.12%     
==========================================
  Files          19       19              
  Lines        3551     3658     +107     
==========================================
+ Hits         2563     2636      +73     
- Misses        751      781      +30     
- Partials      237      241       +4     

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