Dev pwm #401

[sjpark608]

Closes #401

• added try except finally for set_config() method to bubble up the error
• Init_pwm throws OS/IO/PWM error during integration test where it opens and closes concurrently. This is not a normal use case and should bubble up the error. So implemented a locking and raise PWMDeviceError with Exception information

[github-actions[bot]]

Package	Line Rate	Branch Rate	Health
adc	92%	89%	✔
calibration	100%	100%	✔
dac	100%	97%	✔
digital_input	100%	100%	✔
digital_output	98%	95%	✔
eeprom	83%	63%	✔
eeprom.protobuf_assets.eeprom_data_classes	97%	52%	✔
eeprom.protobuf_assets.generated_pb2	79%	50%	✔
gpio	99%	96%	✔
led	0%	0%	❌
peripherals	90%	50%	✔
pwm	96%	95%	✔
reg_helper	97%	85%	✔
relay	100%	100%	✔
tc	98%	98%	✔
utilities	100%	100%	✔
Summary	93% (3125 / 3360)	82% (653 / 797)	✔