feature: make retry behavior user-configurable (#741)

* feature: add retry_config to aws_config::ConfigLoader and aws_config::default_provider
feature: add retry_config to aws_types::Config and aws_types::Builder
feature: add RetryConfig and RetryMode to smithy_types
feature: create EnvironmentVariableRetryConfigProvider
feature: create RetryConfigProviderChain
feature: create ProfileFileRetryConfigProvider
update: make smithy-types dep non-optional for aws-config
add: smithy-types dep to aws-types

* Update aws/rust-runtime/aws-config/src/lib.rs

Co-authored-by: John DiSanti <jdisanti@amazon.com>

* refactor: simplify configuration logic of retry_configs
update: use non-allocating string comparison for RetryMode::from_str
update: panic on setting invalid values for RetryConfig
remove: provider chain for retry_config
remove: ProvideRetryConfig trait and related functionality

* update: AwsFluentClientDecorator to work with retry_config
refactor: rename smithy_client::retry::Config.max_retries to max_attempts and fix code broken by this change
add: RetryConfigDecorator to smithy codegen with example and test
add: RetryConfigDecorator to decorators list
add: update SharedConfigDecorator to work with retry_config
add: prop getters to RetryConfig
add: From<RetryConfig> for smithy_client::retry::Config
update: RegionDecorator example of generated code
sort: decorators list alphabetically

* fix: clone moved valued in AwsFluentClientDecorator
update: imds client to refer to max attempts instead of max retries
fix: clippy lint about FromStr
add: RetryModeErr error struct for when FromStr fails
fix: code affected by added FromStr<RetryMode> trait usage

* formatting: run rustfmt

* format: use 1.53 version of fustfmt

* fix: smithy_client tests broken by max_attempts change

* fix: clarify some confusing counter logic around request attempts

* update: set_retry_config example code to be more helpful
fix: broken docs link

* add: missing PartialEq impl for RetryConfig
update: EnvironmentVariableRetryConfigProvider tests
remove: unused import

* update: CHANGELOGs

* update: Config builder decorators to match Config builder methods

* fix: old references to ProtocolConfig

* refactor: surface all retry_config errors in the default_provider
add: RetryConfigErr

* update: Changelog to not new semantics of max_attempts
update: Config::retry_config() example
fix: copy paste error
rename: RetryModeErr to RetryModeParseErr
update: note valid retry modes in error message
add: helper for creating RetryConfig that disables retries
update: use Cow<&str> for RetryConfigErr to save on allocations
add: FailedToParseMaxAttempts error when creating RetryConfig from invalid max_attempts
update: don't ignore invalid/unparseable max_attempts
update: note panic that can occur in retry_config::default_provider
remove: invalid/useless code from RetryConfigDecorator.kt
remove: inside baseball comments previously added to CHANGELOG

* disable: adaptive RetryMode tests

* fix: don't listen to the IDE, err is being used

* fix: don't listen to the IDE, err is being used

* fix: really struggling with this underscore

* fix: typo in doc comment example

* fix: typo in doc comment example
fix: outdated tests

* Update rust-runtime/smithy-client/src/retry.rs

Co-authored-by: Russell Cohen <russell.r.cohen@gmail.com>

* update: retry_config::default_provider to consider precedence per-field instead of per struct
add: RetryConfigBuilder to make the above possible
update: Env and Profile provider for RetryConfig to return RetryConfigBuilder
add: docs to generated retry_config builders
add: from_slice method to os_shim_internal::Fs

* update: use old ordering of decorators in AwsCodegenDecorator

* update: use old ordering of decorators in AwsCodegenDecorator
fix: os_shim_internal example not compiling
formatting: run ktlint
update: tests broken by RetryConfigDecorator.kt changes

* formatting: don't use * imports in kotlin

* fix: tests broken by stubConfigProject change

* Update codegen/src/test/kotlin/software/amazon/smithy/rust/RetryConfigProviderConfigTest.kt

Co-authored-by: Russell Cohen <russell.r.cohen@gmail.com>

* formatting: run ktlint

* add: back accidentally removed presigning decorator

Co-authored-by: John DiSanti <jdisanti@amazon.com>
Co-authored-by: Russell Cohen <russell.r.cohen@gmail.com>