feat: adding icon support to toggle group

[palbizu]

Description

Icon support was added for toggle groups, keeping support for labels.

Testing

Visual Testing

Checklist:

• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• Any dependent changes have been merged and published in downstream modules

Documentation

Make sure that you have documented corresponding changes in this repository or hypertrace docs repo if required.

[codecov]

Codecov Report

Merging #677 (79efd34) into main (fc33c22) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #677   +/-   ##
=======================================
  Coverage   85.22%   85.22%           
=======================================
  Files         780      780           
  Lines       16052    16054    +2     
  Branches     2070     2070           
=======================================
+ Hits        13680    13682    +2     
  Misses       2337     2337           
  Partials       35       35           

Impacted Files	Coverage Δ
...ponents/src/toggle-group/toggle-group.component.ts	89.74% <ø> (ø)
...components/src/toggle-group/toggle-group.module.ts	100.00% <100.00%> (ø)
...mponents/src/toggle-group/toggle-item.component.ts	100.00% <100.00%> (ø)

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[github-actions]

Unit Test Results

    4 files  ±0  244 suites  ±0   15m 58s ⏱️ + 1m 24s
878 tests ±0  878 ✔️ ±0  0 💤 ±0  0 ❌ ±0 
882 runs  ±0  882 ✔️ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 0234ae5. ± Comparison against base commit fc33c22.