Allow customer to manipulate auto-insstrumention both enable/disable

[mxiamxia]

Description of changes:
Fully support NodeJS enable/disable configuration

if both OTEL_NODE_ENABLED_INSTRUMENTATIONS and OTEL_NODE_DISABLED_INSTRUMENTATIONS are not configured, set OTEL_NODE_ENABLED_INSTRUMENTATIONS="aws-sdk,aws-lambda"
else if OTEL_NODE_ENABLED_INSTRUMENTATIONS is configure and OTEL_NODE_DISABLED_INSTRUMENTATIONS is not, append OTEL_NODE_ENABLED_INSTRUMENTATIONS with "aws-lambda"
else if both OTEL_NODE_ENABLED_INSTRUMENTATIONS and OTEL_NODE_DISABLED_INSTRUMENTATIONS are configured, append OTEL_NODE_ENABLED_INSTRUMENTATIONS with "aws-lambda"
else do nothing

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[wangzlei]

LGTM