feat: bindings for EndpointsRuleEngine

[ganeshnj]

Issue #, if available:
awslabs/aws-sdk-swift#624

Description of changes:

CRT implements the rule set evaluation system and this change creates bindings for Swift SDK. The usage of API is quite straight forward which is 1:1 of C APIs

// engine must be initialized with a rule set string
let engine = try CRTAWSEndpointsRuleEngine(partitions: partitions, ruleSet: ruleSet)

// populate context with available params
let context = try CRTAWSEndpointsRequestContext()
try context.add(name: "Region", value: "us-west-2")

// resolve
let endpoint = try engine.resolve(context: context)
let url = try endpoint?.getURL()

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[ganeshnj]

strict is ignoring the .swiftlint config file and redundant to the line 20 after removing strict.