chore: column encryption parsing support

[MichaelSun90]

Add the support for parsing column encryption token within feature exchange token.

[codecov]

Codecov Report

❌ Patch coverage is 69.84127% with 38 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.79%. Comparing base (7e84a2f) to head (62dd02c).
⚠️ Report is 55 commits behind head on master.

Files with missing lines	Patch %	Lines
src/token/colmetadata-token-parser.ts	68.13%	24 Missing and 5 partials ⚠️
src/always-encrypted/cek-entry.ts	62.50%	2 Missing and 1 partial ⚠️
src/metadata-parser.ts	33.33%	2 Missing ⚠️
src/token/feature-ext-ack-parser.ts	77.77%	1 Missing and 1 partial ⚠️
src/token/helpers.ts	50.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1613      +/-   ##
==========================================
- Coverage   79.17%   77.79%   -1.39%     
==========================================
  Files          93       96       +3     
  Lines        4860     5026     +166     
  Branches      934      958      +24     
==========================================
+ Hits         3848     3910      +62     
- Misses        710      810     +100     
- Partials      302      306       +4     

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