Moved utils helpers(useColorPicker) to src/services

[Dilshaad21]

Summary

Summarize your PR. If it includes design elements include a screenshot or gif.

Checklist

• Check against all themes for compatibility in both light and dark modes
• Checked in mobile
• Checked in IE11 and Firefox
• Props have proper autodocs
• Added documentation examples
• Added or updated jest tests
• Checked for breaking changes and labeled appropriately
• Checked for accessibility including keyboard-only and screenreader modes
• A changelog entry exists and is marked appropriately

[kibanamachine]

Since this is a community submitted pull request, a Jenkins build has not been kicked off automatically. Can an Elastic organization member please verify the contents of this patch and then kick off a build manually?

[cla-checker-service]

❌ Author of the following commits did not sign a Contributor Agreement:
073c91c

Please, read and sign the above mentioned agreement if you want to contribute to this project

[anishagg17]

@Dilshaad21 please make a change in changelog.md

[thompsongl]

Thanks for your effort, @Dilshaad21

We're happy to see you want to contribute to EUI, so here are a couple notes:

• Be sure to sign the CLA. See the comment from the cla-checker-service in the thread above.
• Be sure to fully complete the relevant items in the PR summary template, such as adding a description with issue references and marking checklist items.
• Documenting your changes and PRs really helps us review faster and ensure that EUI maintains consistency from person to person. See the contributing guidelines for details.

For this PR specifically, we'd want to move to a different src/services directory (confusing, I know). [eui-root]/src-docs is for documentation only. We want to be able to use this hook from [eui-root]/src, so a new file somewhere in [eui-root]/src/services is a better location.

[thompsongl]

@Dilshaad21 Checking in. Do you plan on updating this PR?

If you're still interested in this issue, some changes were recently made in #2850 that will impact your work.

If not, let us know and we'll reassign the issue.

[thompsongl]

#3067 addresses the same issue and will soon be merging