add custom flash partitions

espflash.toml

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+[idf_format_args]
+partition_table = "partitions.csv"

partitions.csv

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+# ESP-IDF Partition Table
+# Name,Type,SubType,Offset,Size,Flags
+nvs,data,nvs,0x9000,0x6000,
+phy_init,data,phy,0xf000,0x1000,
+# We keep the default layout more or less. But here we add a partition for more data before our application
+more_nvs,data,nvs,0x10000,0xfa000,
+# no offset given -> tool infers it for us
+factory,app,factory,        ,0xea6000,
+