extend pager theme to allow for styling of item counts

[steppy452]

PR Checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

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

What is the current behavior?

Issue Number: N/A

The pager counts were mostly just inline text without ability to be styled

What is the new behavior?

Ability to customize styling of counts as well as the full text. Also updated storybook to include these in the custom theme story

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

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