bug: fluent-bit flushSeconds should support fractional values

[jjsiv]

Describe the issue

It is currently not possible to use fractional values for flushSeconds, e.g 0.1s. My suggestion is to change it to float. This shouldn't break backwards compatibility

To Reproduce

apiVersion: fluentbit.fluent.io/v1alpha2
kind: ClusterFluentBitConfig
metadata:
  name: fluent-bit-config
spec:
  inputSelector:
    matchLabels:
      fluentbit.fluent.io/enabled: "true"
  outputSelector:
    matchLabels:
      fluentbit.fluent.io/enabled: "true"
  service:
    flushSeconds: 0.1

Expected behavior

ClusterFluentBitConfig supports fractional values for flushSeconds

Your Environment

- Fluent Operator version:
- Container Runtime:
- Operating system:
- Kernel version:

How did you install fluent operator?

No response

Additional context

Even though official fluent-bit docs describe the value for Flush as int type, it is in fact a double
https://github.com/fluent/fluent-bit/blob/master/include/fluent-bit/flb_config.h#L49