Add support for JSON output format for logs

[Karthik-K-N]

What this PR does / why we need it:

Most of the core components of cluster-api supports JSON output format for logs and capi is planning to make json output format for logs as default in future releases rather than having text output format like now.
This PR adds support for the same in cluster-api-provider-ibmcloud repository, This will help in easy parsing of logs in obervability tools.

User needs to pass additional flag --logging-format=json to set the output log format to JSON

Default text format log output

I0923 08:58:50.656130       1 reflector.go:302] Stopping reflector *v1beta2.IBMVPCMachineTemplate (10m27.692803049s) from pkg/mod/k8s.io/[email protected]/tools/cache/reflector.go:232
I0923 08:58:50.660508       1 reflector.go:302] Stopping reflector *v1beta2.IBMPowerVSMachineTemplate (9m52.646239995s) from pkg/mod/k8s.io/[email protected]/tools/cache/reflector.go:232
I0923 08:58:50.666075       1 internal.go:541] "Stopping and waiting for webhooks"
I0923 08:58:50.669962       1 server.go:249] "Shutting down webhook server with timeout of 1 minute" logger="controller-runtime.webhook"
I0923 08:58:50.672521       1 internal.go:544] "Stopping and waiting for HTTP servers"
I0923 08:58:50.673560       1 server.go:254] "Shutting down metrics server with timeout of 1 minute" logger="controller-runtime.metrics"
I0923 08:58:50.673729       1 server.go:68] "shutting down server" name="health probe" addr="[::]:9440"
I0923 08:58:50.673822       1 internal.go:548] "Wait completed, proceeding to shutdown the manager"

Log format when JSON output format is set

{"ts":1727081930843.5164,"logger":"controller-runtime.metrics","caller":"server/server.go:247","msg":"Serving metrics server","v":0,"bindAddress":":8443","secure":true}
{"ts":1727081934322.6074,"caller":"leaderelection/leaderelection.go:367","msg":"lock is held by capi-ibmcloud-controller-manager-7d574bbf58-ptbqk_4eaa0a09-0efc-4bd1-95f2-ae84e4ac9f47 and has not yet expired","v":4}
{"ts":1727081934322.689,"caller":"leaderelection/leaderelection.go:255","msg":"failed to acquire lease capi-ibmcloud-system/effcf9b8.cluster.x-k8s.io","v":4}
{"ts":1727081936795.2607,"caller":"leaderelection/leaderelection.go:367","msg":"lock is held by capi-ibmcloud-controller-manager-7d574bbf58-ptbqk_4eaa0a09-0efc-4bd1-95f2-ae84e4ac9f47 and has not yet expired","v":4}
{"ts":1727081936795.3213,"caller":"leaderelection/leaderelection.go:255","msg":"failed to acquire lease capi-ibmcloud-system/effcf9b8.cluster.x-k8s.io","v":4}
{"ts":1727081941185.4644,"caller":"leaderelection/leaderelection.go:367","msg":"lock is held by capi-ibmcloud-controller-manager-7d574bbf58-ptbqk_4eaa0a09-0efc-4bd1-95f2-ae84e4ac9f47 and has not yet expired","v":4}

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:

/area provider/ibmcloud

1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Release note:

Add support for JSON output format for logs

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[mkumatag]

@Karthik-K-N can you please update the description with the details like what additional flags it will add and how users can use them and also sample logs post applying this option?

[Amulyam24]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Karthik-K-N, mkumatag

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