feat: add Gradle codegen

[mtdowling]

Issue #, if available:

Description of changes:

Note: this also renames the SDK code generation package to "sdk-codegen".

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Codecov Report

Merging #458 into add-smithy-generator will increase coverage by 0.34%.
The diff coverage is n/a.

@@                   Coverage Diff                   @@
##           add-smithy-generator    #458      +/-   ##
=======================================================
+ Coverage                 96.16%   96.5%   +0.34%     
=======================================================
  Files                        79      72       -7     
  Lines                      1355    1231     -124     
  Branches                    253     224      -29     
=======================================================
- Hits                       1303    1188     -115     
+ Misses                       52      43       -9

Impacted Files	Coverage Δ
packages/middleware-stack/src/index.ts	100% <0%> (ø)	⬆️
packages/middleware-retry/src/configurations.ts
packages/middleware-retry/src/delayDecider.ts
packages/middleware-retry/src/retryMiddleware.ts
packages/middleware-retry/src/constants.ts
packages/middleware-signing/src/middleware.ts
packages/middleware-retry/src/defaultStrategy.ts
packages/middleware-retry/src/retryDecider.ts

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