fix(sdk-trace-base): fix crash on environments without global document

[legendecas]

Which problem is this PR solving?

Fixes crash on sdk-trace-base BatchSpanProcess in environments like webworker and deno.

Short description of the changes

• Fix checks on presence of document.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• WebWorker test enabled for sdk-trace-base
• Add new simple case for BatchSpanProcessor

Checklist:

• Followed the style guidelines of this project
• Unit tests have been added
• Documentation has been updated

[codecov]

Codecov Report

Merging #3000 (56d8c85) into main (0ed21bc) will decrease coverage by 0.15%.
The diff coverage is 60.00%.

❗ Current head 56d8c85 differs from pull request most recent head c140e8e. Consider uploading reports for the commit c140e8e to get more accurate results

@@            Coverage Diff             @@
##             main    #3000      +/-   ##
==========================================
- Coverage   92.78%   92.63%   -0.16%     
==========================================
  Files         185      187       +2     
  Lines        6142     6166      +24     
  Branches     1296     1301       +5     
==========================================
+ Hits         5699     5712      +13     
- Misses        443      454      +11     

Impacted Files	Coverage Δ
.../src/platform/browser/export/BatchSpanProcessor.ts	45.00% <33.33%> (ø)
...kages/opentelemetry-sdk-trace-base/karma.worker.js	100.00% <100.00%> (ø)