feat(sidebar): add custom chevron icon to collapse

[rluders]

• I have followed the Your First Code Contribution section of the Contributing guide

Adds the chevronIcon and renderChevronIcon properties to Sidebar.Collapse component, allowing users to customize the chevron icon for collapsed sidebar items.

BREAKING CHANGE:

FlowbiteSidebarCollapseTheme signature changes:

label: {
    base: string;
-    icon: string;
+    icon: {
+      base: string;
+      open: FlowbiteBoolean;
+    };
}

Closes #888

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
flowbite-react	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 25, 2023 6:27pm

[codecov]

Codecov Report

Patch coverage: 99.72% and project coverage change: -0.03% ⚠️

Comparison is base (7461173) 99.54% compared to head (f80c27b) 99.52%.
Report is 54 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #891      +/-   ##
==========================================
- Coverage   99.54%   99.52%   -0.03%     
==========================================
  Files         163      167       +4     
  Lines        6621     6938     +317     
  Branches      401      419      +18     
==========================================
+ Hits         6591     6905     +314     
- Misses         30       33       +3     

Files Changed	Coverage Δ
src/components/Toast/theme.ts	100.00% <ø> (ø)
src/components/Sidebar/SidebarCollapse.tsx	99.09% <94.11%> (-0.91%)	⬇️
src/components/Dropdown/Dropdown.tsx	99.24% <99.43%> (-0.76%)	⬇️
src/components/Badge/Badge.tsx	100.00% <100.00%> (ø)
src/components/Button/Button.tsx	100.00% <100.00%> (ø)
src/components/Button/ButtonBase.tsx	100.00% <100.00%> (ø)
src/components/Button/theme.ts	100.00% <100.00%> (ø)
src/components/Card/Card.tsx	100.00% <100.00%> (ø)
src/components/Carousel/Carousel.tsx	99.09% <100.00%> (+0.12%)	⬆️
src/components/DarkThemeToggle/DarkThemeToggle.tsx	100.00% <100.00%> (ø)
... and 19 more

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[tulup-conner]

lgtm

[tulup-conner]

CodeQL is spinning indefinitely on this for some reason, so I'm bypassing protections