[deprecation] Add v1beta1 CRDs for LinodeMachine and LinodeCluster

[AshleyDumaine]

What this PR does / why we need it: Solidifies the CRD specs for the first beta version for LinodeMachine and LinodeCluster. This adds conversion webhooks to move from v1alpha2 to v1beta1 with the goal to eventually remove v1alpha2 CRDs.

CRDs to handle:

• LinodeMachine
  • Removes Group which is marked deprecated on linodego (adds the deprecation marker on v1alpha2)
  • Moves Kernel up out of the otherwise empty Configuration struct
  • changes DiskEncryption to use linodego's type so we don't need to cast it
  • Shuffles fields around to make it easier to compare to linodego InstanceCreateOptions (which we can't use directly because of issues around DeepCopy code generation)
• LinodeMachineTemplate
• LinodeCluster
  • Breaks out all DNS config into a new DNSConfig struct
  • Breaks out all NodeBalancer config into a new NodeBalancerConfig struct
• LinodeClusterTemplate

To handle in follow-up PRs

• LinodeFirewall
• AddressSet
• FirewallRule
• LinodeObjectStorageBucket
• LinodeObjectStorageKey
• LinodePlacementGroup
• LinodeVPC

NOTE: Once the CRD specs are solidified, the controllers should be updated to use the v1beta1 APIs (which will be the storage version even if the deprecated v1alpha2 CRDs are used)

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

TODOs:

• squashed commits
• includes documentation
• adds unit tests
• adds or updates e2e tests

[codecov]

Codecov Report

❌ Patch coverage is 1.29870% with 76 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.85%. Comparing base (7e59229) to head (f5e570f).
⚠️ Report is 72 commits behind head on main.

Files with missing lines	Patch %	Lines
api/v1beta1/linodemachine_types.go	0.00%	24 Missing ⚠️
api/v1beta1/linodecluster_types.go	0.00%	20 Missing ⚠️
api/v1beta1/linodemachinetemplate_types.go	0.00%	10 Missing ⚠️
cmd/main.go	11.11%	8 Missing ⚠️
internal/webhook/v1beta1/linodecluster_webhook.go	0.00%	3 Missing ⚠️
internal/webhook/v1beta1/linodemachine_webhook.go	0.00%	3 Missing ⚠️
api/v1beta1/linodeclustertemplate_conversion.go	0.00%	2 Missing ⚠️
api/v1beta1/linodeclustertemplate_types.go	0.00%	2 Missing ⚠️
api/v1beta1/linodemachinetemplate_conversion.go	0.00%	2 Missing ⚠️
api/v1beta1/linodecluster_conversion.go	0.00%	1 Missing ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #929      +/-   ##
==========================================
- Coverage   66.64%   65.85%   -0.79%     
==========================================
  Files          71       81      +10     
  Lines        6352     6429      +77     
==========================================
+ Hits         4233     4234       +1     
- Misses       1820     1896      +76     
  Partials      299      299              

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