Feedback from forum user. Different modem may require different AT command timeout value. This pull request enables user to set AT command timeout value in cellular_config.h.
Add CELLULAR_COMMON_AT_COMMAND_TIMEOUT_MS config to set timeout value for Cellular_Common prefix APIs.
Add CELLULAR_AT_COMMAND_RAW_TIMEOUT_MS config to set timeout value for Cellular_ATCommandRaw API.
Add cellular common AT command timeout config
Feedback from forum user. Different modem may require different AT command timeout value. This pull request enables user to set AT command timeout value in cellular_config.h.