feat: implement monitoring bootstrap

Walkthrough

The changes introduce comprehensive monitoring capabilities to the GreptimeDBCluster by adding new specifications for monitoring configuration, log collection, and vector instance management. Key structures such as MonitoringSpec, LogsCollectionSpec, and VectorSpec are created, along with methods for managing these new types. Additionally, constants for default configurations and a monitoring deployer are introduced, enhancing the deployment process and ensuring proper integration of monitoring features.

Changes

Files	Change Summary
`apis/v1alpha1/greptimedbcluster_types.go`, `apis/v1alpha1/defaulting.go`	Added monitoring configurations including `MonitoringSpec`, `LogsCollectionSpec`, and `VectorSpec`. Introduced getter methods and status structures.
`apis/v1alpha1/constants.go`	Added constants for default images and resource requests for GreptimeDB and vector components.
`controllers/greptimedbcluster/deployers/monitoring.go`	Introduced `MonitoringDeployer` struct for managing monitoring components and Kubernetes objects.
`controllers/greptimedbcluster/deployers/common.go`	Added methods for vector configuration volume and sidecar management, enhancing logging and configuration management.
`tests/e2e/greptimedbcluster/test_cluster_enable_monitoring.go`, `tests/e2e/greptimedbcluster/test_basic_cluster.go`, `tests/e2e/greptimedbcluster/test_cluster_enable_flow.go`, `tests/e2e/greptimedbcluster/test_cluster_standalone_wal.go`	Enhanced tests to verify retrieval of cluster instances after creation and ensure proper monitoring functionality.
`tests/e2e/testdata/resources/cluster/enable-monitoring/cluster.yaml`	Added configuration for a GreptimeDBCluster resource with monitoring enabled.

Possibly related PRs

#186: The introduction of Validate() and Check() methods in the GreptimeDBCluster and GreptimeDBStandalone structures relates to the main PR's changes in constants and configurations, as both involve enhancing the validation and configuration management of GreptimeDB components.
#191: The refactor to separate ports configuration from the frontend instance and service directly connects to the main PR's introduction of new constants for various ports, indicating a broader effort to improve configuration management within the GreptimeDB setup.

Suggested reviewers

daviderli614

Poem

In the meadow where the bunnies play,
New features hop in, brightening the day.
Monitoring's here, with logs to collect,
Vector's sidecars, oh what a perfect effect!
With each little change, our cluster will thrive,
Hopping along, keeping data alive! 🐇✨

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GreptimeTeam / greptimedb-operator