Update cleanValue() to allow non-object values(string, number, etc.)

[jimsleon]

React-select is great and easy to use. I had a simple wrapper around react-select to allow non-object options like string, number, etc. for simple use case so that I don't need to construct object with 'label' & 'value' from simple type by overriding getOptionValue() and getOptionLabel(), but found it doesn't work.(display works fine but can't select a value), it does work for multiple selection. After looked into code I found it is caused by clearValue() which assuming 'option' is object. cleanValue() is only used for processing 'value' property, so please review if this can be merged.

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[L3au]

@jimsleon Nice work. The bad news is I don't think the collaborator would accept this change after I checked the early related issues and PR.

• Find correct option when value is passed as a string Find correct option when value is passed as a string #3050
• Allow passing of primitive values as value prop Allow passing of primitive values as value prop #2908
• simple value in upgrade guide https://react-select.netlify.app/upgrade-guide#simple-value
• some explanations [V2] Setting initial value of select component with a string value no longer works #2669 (comment) [V2] Setting initial value of select component with a string value no longer works #2669 (comment) Allow passing of primitive values as value prop #2908 (comment)
• a wrapper for this case was created. https://github.com/jossmac/react-select-simple-value

[jimsleon]

@jimsleon Nice work. The bad news is I don't think the collaborator would accept this change after I checked the early related issues and PR.

• Find correct option when value is passed as a string Find correct option when value is passed as a string #3050
• Allow passing of primitive values as value prop Allow passing of primitive values as value prop #2908
• simple value in upgrade guide https://react-select.netlify.app/upgrade-guide#simple-value
• some explanations #2669 (comment) #2669 (comment) #2908 (comment)
• a wrapper for this case was created. https://github.com/jossmac/react-select-simple-value

Probably, but my change is a little bit different, I didn't change any contract of react-select. 🤞

[bladey]

@JedWatson to review and comment.