You did already include it via the EsoGrinder.txt file then.
It's exactly what I had described you: Your addon's txt file needs to hardcode the lua files you want to include in your addon's usage, and you did that via the line
esoui_constants_live.lua
If you want to call the functions from esoui_constants_live.lua now you just need to use them in your EsoGrinder.lua code e.g. via
local variableName = ActionBarSlotType_get_string(ACTION_TYPE_ABILITY)
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