Combine the MBEDTLS_SSL_CID_PADDING_GRANULARITY and MBEDTLS_SSL_TLS1_3_PADDING_GRANULARITY options
This change affects users who modified the default mbedtls_config.h padding granularity settings, i.e. enabled at least one of the options.
The mbedtls_config.h options MBEDTLS_SSL_CID_PADDING_GRANULARITY and MBEDTLS_SSL_TLS1_3_PADDING_GRANULARITY were combined into one option because they used exactly the same padding mechanism and hence their respective padding granularities can be used in exactly the same way. This change simplifies the code maintenance.
The new single option MBEDTLS_SSL_CID_TLS1_3_PADDING_GRANULARITY can be used for both DTLS-CID and TLS 1.3.