chore: Add craig-rueda as codeowner of Helm Chart

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SUMMARY

I feel that @craig-rueda should be mentioned as codeowner of Helm Chart as maintainer of Helm Chart:

superset/helm/superset/Chart.yaml

Lines 21 to 24 in 1fbdabd

	maintainers:
	- name: craig-rueda
	email: craig@craigrueda.com
	url: https://github.com/craig-rueda

It also documents responsibility in project.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A

TESTING INSTRUCTIONS

N/A

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API