Add support for GPT-4-32K and GPT-4-32K-0314 models

[aeieli]

This PR adds support for the GPT-4-32K and GPT-4-32K-0314 models by adding three new constants to the list of GPT models and adding the new models to the switch statements in the CreateChatCompletion and CreateCompletion functions. The PR also removes unnecessary code that checked for invalid models, as the new models are valid. The changes in this PR do not introduce any new issues and successfully add support for the new models.

Changes Made:

Added three new constants for GPT-4-32K and GPT-4-32K-0314 models Added new models to switch statements in CreateChatCompletion and CreateCompletion functions Removed unnecessary code that checked for invalid models

[codecov[bot]]

Codecov Report

Merging #158 (505af4f) into master (f4a6a99) will increase coverage by 0.28%. The diff coverage is 80.00%.

@@            Coverage Diff             @@
##           master     #158      +/-   ##
==========================================
+ Coverage   50.19%   50.48%   +0.28%     
==========================================
  Files          16       16              
  Lines         516      517       +1     
==========================================
+ Hits          259      261       +2     
  Misses        201      201              
+ Partials       56       55       -1     

Impacted Files	Coverage Δ
completion.go	47.05% <50.00%> (+5.88%)	:arrow_up:
chat.go	68.42% <100.00%> (+1.75%)	:arrow_up:

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