feat(datepicker): added showSelectedCount for the component

[mertJF]

Description

This PR introduces a new feature to the component: the ability to customize how multiple selected dates are displayed in the input field. By adding the showSelectedCount prop, developers can choose between displaying a count of selected dates or a comma-separated list.

Problem

The existing behavior of displaying a date count in the input field can be less informative for users who need to see the exact dates that have been selected, especially when dealing with a large number of selected dates.

Changes

• A new boolean prop, showSelectedCount, has been added to the component.

• The component's rendering logic has been updated to conditionally render either the date count or a comma-separated list based on the value of the showSelectedCount prop.

• The showSelectedCount prop defaults to true for backward compatibility.

• I've added unit tests to cover the new functionality and ensure that existing functionality remains unaffected.

Screenshots

showSelectedCount: true

showSelectedCount: false

Contribution checklist

• I have followed the contributing guidelines.
• I have added sufficient test coverage for my changes.
• I have formatted my code with Prettier and checked for linting issues with ESLint for code readability.

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.

Project coverage is 96.86%. Comparing base (30babb9) to head (b4c988a).

Files with missing lines	Patch %	Lines
src/index.tsx	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5227      +/-   ##
==========================================
- Coverage   96.89%   96.86%   -0.03%     
==========================================
  Files          29       29              
  Lines        3381     3385       +4     
  Branches     1401     1416      +15     
==========================================
+ Hits         3276     3279       +3     
+ Misses        105      104       -1     
- Partials        0        2       +2     

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[pullrequest]

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[pullrequest]

PullRequest Breakdown

Reviewable lines of change

+ 49
- 3

54% TypeScript (tests)
23% TSX
21% TypeScript
2% TSX (tests)

Type of change

Feature - These changes are adding a new feature or improvement to existing code.

[pullrequest]

The change looks good and matches the description

Xiaoyong W

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