feat: adding box-shadow global variable

[palbizu]

Description

Adding box-shadow Global variable in layout.

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 #1112 (6ec5ff5) into main (33d830c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1112   +/-   ##
=======================================
  Coverage   85.10%   85.10%           
=======================================
  Files         822      822           
  Lines       17009    17009           
  Branches     2158     2158           
=======================================
  Hits        14476    14476           
  Misses       2502     2502           
  Partials       31       31           

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[github-actions]

Unit Test Results

    4 files  265 suites   18m 36s ⏱️
957 tests 957 ✔️ 0 💤 0 ❌
964 runs  964 ✔️ 0 💤 0 ❌

Results for commit 0c06bb1.