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

Merging #1477 (a0eebf9) into master (5015634) will decrease coverage by 0.42%.
The diff coverage is 82.58%.

@@            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              

Impacted Files	Coverage Δ
src/value-parser.ts	81.72% <50.00%> (-0.23%)	⬇️
src/token/colmetadata-token-parser.ts	71.73% <62.50%> (-4.46%)	⬇️
src/token/returnvalue-token-parser.ts	71.42% <62.50%> (-17.47%)	⬇️
src/token/returnstatus-token-parser.ts	70.00% <66.66%> (-30.00%)	⬇️
src/token/infoerror-token-parser.ts	72.72% <72.72%> (-27.28%)	⬇️
src/token/order-token-parser.ts	80.00% <78.57%> (-20.00%)	⬇️
src/token/loginack-token-parser.ts	85.00% <83.33%> (-15.00%)	⬇️
src/metadata-parser.ts	92.59% <92.30%> (+0.59%)	⬆️
src/token/buffer-reader.ts	92.68% <92.68%> (ø)
src/token/stream-parser.ts	71.65% <0.00%> (-2.14%)	⬇️
... and 2 more

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