Add numberSelector utility

[trivikr]

Issue #, if available:

• Currently used in NODE_MAX_ATTEMPT_CONFIG_OPTIONS

  smithy-typescript/packages/middleware-retry/src/configurations.ts

  Lines 15 to 35 in 2df620b

  	export const NODE_MAX_ATTEMPT_CONFIG_OPTIONS: LoadedConfigSelectors<number> = {
  	environmentVariableSelector: (env) => {
  	const value = env[ENV_MAX_ATTEMPTS];
  	if (!value) return undefined;
  	const maxAttempt = parseInt(value);
  	if (Number.isNaN(maxAttempt)) {
  	throw new Error(`Environment variable ${ENV_MAX_ATTEMPTS} mast be a number, got "${value}"`);
  	}
  	return maxAttempt;
  	},
  	configFileSelector: (profile) => {
  	const value = profile[CONFIG_MAX_ATTEMPTS];
  	if (!value) return undefined;
  	const maxAttempt = parseInt(value);
  	if (Number.isNaN(maxAttempt)) {
  	throw new Error(`Shared config file entry ${CONFIG_MAX_ATTEMPTS} mast be a number, got "${value}"`);
  	}
  	return maxAttempt;
  	},
  	default: DEFAULT_MAX_ATTEMPTS,
  	};

• Required in feat(middleware-compression): add middleware for request compression aws/aws-sdk-js-v3#5618

Description of changes:

Add numberSelector utility in util-config-selector

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