refactor: remove callback nesting from parsers

[mShan0]

Continues the refactor of parsers based on #1448.

Refactors the following token parsers:

• LoginAck
• Order
• ReturnStatus
• Info and Error
• metadataParse portion of ColumnMetadata

Buffer read functions are in in a separate file/class

[codecov]

Codecov Report

Attention: Patch coverage is 82.58427% with 31 lines in your changes missing coverage. Please review.

Project coverage is 80.08%. Comparing base (5015634) to head (a0eebf9).
Report is 62 commits behind head on master.

Files	Patch %	Lines
src/token/infoerror-token-parser.ts	72.72%	6 Missing ⚠️
src/metadata-parser.ts	92.30%	2 Missing and 2 partials ⚠️
src/token/buffer-reader.ts	92.68%	2 Missing and 1 partial ⚠️
src/token/colmetadata-token-parser.ts	62.50%	3 Missing ⚠️
src/token/loginack-token-parser.ts	83.33%	3 Missing ⚠️
src/token/order-token-parser.ts	78.57%	3 Missing ⚠️
src/token/returnstatus-token-parser.ts	66.66%	3 Missing ⚠️
src/token/returnvalue-token-parser.ts	62.50%	3 Missing ⚠️
src/value-parser.ts	50.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1477      +/-   ##
==========================================
- Coverage   80.50%   80.08%   -0.43%     
==========================================
  Files          91       92       +1     
  Lines        4669     4750      +81     
  Branches      856      865       +9     
==========================================
+ Hits         3759     3804      +45     
- Misses        634      670      +36     
  Partials      276      276              

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