Adding configurable filter header height

[pkasperowicz]

Description

Filter header has fixed height 45px. Added prop for the configurable height with default 45px.

Please check if the PR fulfills these requirements

• [ x] The commit message follows our guidelines: https://github.com/adazzle/react-data-grid/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x")

[ ] Bugfix
[x ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Other... Please describe:

What is the current behavior? (You can also link to an open issue here)
The height of columns is fixed to 45px.

What is the new behavior?
The height of columns can be configured.

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

[ ] Yes
[X ] No

If this PR contains a breaking change, please describe the impact and migration path for existing applications: ...

Other information:

[coveralls]

Changes Unknown when pulling bde5d47 on pkasperowicz:Custom_Filter_Header_Height into ** on adazzle:master**.

[coveralls]

Changes Unknown when pulling bde5d47 on pkasperowicz:Custom_Filter_Header_Height into ** on adazzle:master**.