feat(helm): add remaining options for bootstrap

[iblackman]

Description

This PR adds the possibility to pass any option for the bootstrap component on the opensearch-cluster chart. As of now the only one that can be set using the chart is additionalConfig.

Issues Resolved

#667 . At least on the chart aspect.

Check List

• Commits are signed per the DCO using --signoff
• Unittest added for the new/changed functionality and all unit tests are successful
• Customer-visible features documented
• No linter warnings (make lint)

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[swoehrl-mw]

Hi @iblackman.

Thank you for raising this PR.

Another option is to replace the whole block for whatever is inside the .Values.opensearchCluster.bootstrap. It would make the maintenance of the chart simpler in favor of not having explicit options.

Looking at it I think I prefer that option. Would you mind reworking your PR to that?

[iblackman]

Looking at it I think I prefer that option. Would you mind reworking your PR to that?

@swoehrl-mw Done and PR description updated. Could you review it again?