chore: column encryption parsing support

[MichaelSun90]

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

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 69.84127% with 38 lines in your changes are missing coverage. Please review.

Project coverage is 77.79%. Comparing base (7e84a2f) to head (62dd02c). Report is 3 commits behind head on master.

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

Additional details and impacted files

```diff @@ 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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