Make an easy dev mode setup option

[JakeSCahill]

What would you like to be added?

Sometimes users just want a single broker with minimal memory for testing in a development environment. Redpanda offers a dev mode, but there's no clear way to enable this in the Helm chart: https://docs.redpanda.com/current/reference/rpk/rpk-redpanda/rpk-redpanda-mode/#development-mode

We currently have a setting config.node.developer_mode that bypasses memory checks and avoids setting a reserve memory. But it doesn't seem to cover the other items that are listed under the Redpanda dev mode.

Related Slack convo: https://redpandadata.slack.com/archives/C01H6JRQX1S/p1709044803831339

Why is this needed?

It's currently difficult for users to know which flags and values to set to run Redpanda in development mode in Kubernetes. We should make it as easy as possible as we do for Redpanda core.

JIRA Link: K8S-109

[JakeSCahill]

Aside: Write caching is enabled in dev mode by default in Redpanda core release 24.1.