Added 'width', 'show-alpha', 'disable-input-field' prop and some default-colors style fix.

[Akash187]

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)
• All tests are passing
• New/updated tests are included

If adding a new feature, the PR's description includes:

• Added width prop to pass width show that user can change the width of color picker current 198px width seems to be a bit small.
• Added show-alpha prop to show and hide alpha panel and rgba box.
• Added disable-input-field prop to disable user from manually enter color value. This is helpful because sometimes you don't want users to enter invalid colors. Disabling input can prevent such cases.
• Fixed default-colors style.
• Made style scoped so they don't interfere with project style.

Other information:
I was not able to run tests using yarn test getting an error. Image attached.

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