[SERVER-63153] Create ShardingDataTransformMetrics Individual Metrics Stub Class - MongoDB Jira

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This will a per-instance class that will handle all interactions between the Resharding/Global indexes metrics and external callers.

This is a simple example of what it could look like:

class IndividualMetrics {

	std::atomic<counter> _onlyIndividualsNeed;

	SharedMetricsPtr _sharedMetrics;

	CumulativeMetricsPtr _parent;

	IndividualMetrics(OperationContext* opCtx) {

		_parent = CumulativeMetrics::get(opCtx->getServiceContext());

        _sharedMetrics = _parent.createRegisteredSharedMetrics()

	~IndividualMetrics() {

		_parent.deregisterSharedMetrics(_sharedMetrics);

is depended on by

SERVER-63618 Create & Integrate CurrentOp Interface For Global Index Metrics