docs(grafana_datasource): add influxdb flux example

[nutgood]

SUMMARY

I've added an example to grafana_datasource to add the flux version of influxdb programatically. It's very hard to find documentation online, especially for people new to ansible (and grafana).

ISSUE TYPE

• Docs Pull Request

COMPONENT NAME

grafana_datasource

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 71.18%. Comparing base (a3056e9) to head (bc0c6be).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #353 +/- ## ======================================= Coverage 71.18% 71.18% ======================================= Files 18 18 Lines 1898 1898 Branches 332 332 ======================================= Hits 1351 1351 Misses 402 402 Partials 145 145 ``` | [Flag](https://app.codecov.io/gh/ansible-collections/community.grafana/pull/353/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ansible-collections) | Coverage Δ | | |---|---|---| | [integration](https://app.codecov.io/gh/ansible-collections/community.grafana/pull/353/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ansible-collections) | `70.04% <ø> (ø)` | | | [sanity](https://app.codecov.io/gh/ansible-collections/community.grafana/pull/353/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ansible-collections) | `23.22% <ø> (ø)` | | | [units](https://app.codecov.io/gh/ansible-collections/community.grafana/pull/353/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ansible-collections) | `65.18% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ansible-collections#carryforward-flags-in-the-pull-request-comment) to find out more.

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[nutgood]

Done @Nemental :)