Release v3.18.0 · aws/aws-sdk-js-v3

middleware-retry:
- add options to StandardRetryStrategy (#2458) (3110d62e)
- export DefaultRateLimiter (#2463) (b3d13a26)
- move exportable constants to configurations (#2442) (e2fd6e33)
- move non-config interfaces to types.ts (#2435) (c7371b6e)
deps-dev:
- bump prettier to v2.3.0 (#2444) (f4c8f09c)
- bump typescript to ~4.3.2 (#2436) (73d2346b)
protocol_tests: remove @aws-sdk/types from devDeps (#2443) (1c4473c2)

clients:
- update clients as of 06/03/2021 (#2464) (14e8fbf6)
- add retryModeProvider in runtimeConfig (#2440) (fc0a5dae)
support Sigv4 for non AWS services (#2385) (0a251aa4)
middleware-retry:
- call retry strategy based on value in retryMode (#2456) (095b9906)
- add Adaptive Retry Strategy (#2454) (0c9a1439)
- add client side rate limiter for adaptive mode (#2439) (8ef104d0)
codegen: add user agent for non AWS clients (#2415) (6d1a5551)

client-sts: allow overwriting default role assumer http handler (#2426) (7985995e)

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