monitor: Update YAML parser to handle trust groups

It creates a list of group creator lambdas based on
the information in the monitor YAML file.

These lambdas are called by the manager class to cre

monitor: Update YAML parser to handle trust groups

It creates a list of group creator lambdas based on
the information in the monitor YAML file.

These lambdas are called by the manager class to create
the trust group instances.

A real life example is:

const std::vector<CreateGroupFunction> trustGroups
{
{
[]()
{
std::vector<std::string> names{
"fan0_1",
"fan1_1",
"fan2_1",
"fan3_1",
};
return std::make_unique<NonzeroSpeed>(names);
}
},
};

Change-Id: Ia883df35efb86242aae2f8ed7d1714e94e65a6e6
Signed-off-by: Matt Spinler <spinler@us.ibm.com>

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