feat: add isValidHostname function

[srchase]

Adds validHostname function for checking hostname validity. To be used for host prefixing. Ref: smithy-lang/smithy-typescript/pull/104

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[codecov-io]

Codecov Report

Merging #774 into smithy-codegen will increase coverage by <.01%.
The diff coverage is 100%.

@@                Coverage Diff                 @@
##           smithy-codegen     #774      +/-   ##
==================================================
+ Coverage           92.33%   92.34%   +<.01%     
==================================================
  Files                 140      141       +1     
  Lines                2753     2756       +3     
  Branches              478      478              
==================================================
+ Hits                 2542     2545       +3     
  Misses                211      211

Impacted Files	Coverage Δ
packages/protocol-http/src/isValidHostname.ts	100% <100%> (ø)

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[mtdowling]

Maybe I don't understand the JavaScript ecosystem well enough, but this is too small of a package IMO. Could these 4 lines of code can be added to an existing package?

[aws-sdk-js-automation]

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