feat(lacework-agent): codeaware.enable -> experimental (#225)

This commit adds support for the `codeaware.enable` property in
the agent Helm charts. Currently, the `codeaware.enable` property only
accepts `true` or `false` as boolean arguments.

This commit extends the values schema to also accept strings, and limits
this selection with enum selection options. These selection options
include `"experimental"`.

This commit also removes the default value for `codeaware.enable` from
`false` to unset. Setting this to `false` by default always renders to
the codeaware config, which could have the unexpected consequence of
disabling codeaware locally preventing Froyo modifications.