fix(Select/TextInput): fix components typescript interfaces

[boaz0]

A small fix to the typescript check when using TextInput and Select.
There is inconsistency between PropTypes and TypeScript checks.

For example, in TextInput according to PropTypes onChange is optional and its default value is noop (http://patternfly-react.surge.sh/patternfly-4/components/textinput). However, in TypeScript it's a required prop.

Another example is in Select, on one hand onBlur is not required, TS check fails saying onBlur is required.

I updated TS check according to what is given in http://patternfly-react.surge.sh/patternfly-4/

[patternfly-build]

PatternFly-React preview: https://833-pr-patternfly-react-patternfly.surge.sh

[coveralls]

Pull Request Test Coverage Report for Build 2829

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 81.163%

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Totals
Change from base Build 2821:	0.0%
Covered Lines:	3423
Relevant Lines:	3976

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💛 - Coveralls

[dlabaj]

Looks good.