chore: workaround using pkcs1

[jcosentino11]

Issue #, if available:

Description of changes:

Our mqtt5 client currently doesn't work with ssl for windows/mac, due to awslabs/aws-c-io#260. To workaround in the meantime, bridge can encode keys with pkcs1

Why is this change necessary:
Unblock local and windows integration and uat

How was this change tested:

Any additional information or context required to review the change:

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[github-actions]

Unit Tests Coverage Report

File	Coverage	Lines	Branches
All files	83%	88%	77%	✅
com.aws.greengrass.mqtt.bridge.clients.LocalMqtt5Client$1	92%	100%	83%	✅
com.aws.greengrass.mqtt.bridge.clients.MQTTClient	79%	84%	73%	✅
com.aws.greengrass.mqtt.bridge.clients.MQTTClient$1	70%	90%	50%	✅
com.aws.greengrass.mqtt.bridge.clients.IoTCoreClient	81%	80%	83%	✅
com.aws.greengrass.mqtt.bridge.clients.PubSubClient	85%	94%	75%	✅
com.aws.greengrass.mqtt.bridge.clients.IoTCoreClient$1	100%	100%	0%	✅
com.aws.greengrass.mqtt.bridge.clients.LocalMqttClientFactory	84%	92%	75%	✅
com.aws.greengrass.mqtt.bridge.clients.LocalMqtt5Client	83%	87%	79%	✅
com.aws.greengrass.mqtt.bridge.BridgeConfig	96%	97%	95%	✅
com.aws.greengrass.mqtt.bridge.MQTTBridge	70%	89%	50%	✅
com.aws.greengrass.mqtt.bridge.TopicMapping$TopicType	100%	100%	0%	✅
com.aws.greengrass.mqtt.bridge.MessageBridge	71%	85%	56%	✅
com.aws.greengrass.mqtt.bridge.TopicMapping$MappingEntry	100%	100%	100%	✅
com.aws.greengrass.mqtt.bridge.BridgeConfig$2	100%	100%	0%	✅
com.aws.greengrass.mqtt.bridge.MQTTBridge$ConfigurationChangeHandler	100%	100%	100%	✅
com.aws.greengrass.mqtt.bridge.MQTTBridge$CertificateAuthorityChangeHandler	76%	78%	75%	✅
com.aws.greengrass.mqtt.bridge.BridgeConfig$1	100%	100%	0%	✅
com.aws.greengrass.mqtt.bridge.TopicMapping	100%	100%	100%	✅
com.aws.greengrass.mqtt.bridge.model.MqttVersion	100%	100%	0%	✅
com.aws.greengrass.mqtt.bridge.model.MqttMessage	75%	100%	50%	✅
com.aws.greengrass.mqtt.bridge.model.BridgeConfigReference	100%	100%	0%	✅
com.aws.greengrass.mqtt.bridge.model.PubSubMessage	69%	88%	50%	✅
com.aws.greengrass.mqtt.bridge.auth.MQTTClientKeyStore	89%	90%	88%	✅

Minimum allowed coverage is 65%

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