default @NonNull Builder add(@NonNull Context entry) {
            Objects.requireNonNull(entry, "entry");
            add(entry.getKey(), entry.getValue());
            return this;
        }
Adds a context to the set.

@param entry the entry to add
@return the builder
@throws NullPointerException if the entry is null
@see MutableContextSet#add(Context)
api/src/main/java/net/luckperms/api/context/ImmutableContextSet.java