Job system for activity tracking #5284
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Add a registry system centered on `class Registry`. The system supports automatic first-pass registration at construction time. Add a job system, a set of base classes for jobs. The job system is generic, with a mixin class to add application-specific behavior. The mixin class for the library deals with `StorageManager` and `ContextResources`, etc. There's only one remaining `StorageManager` member variable; it's in the mixin class. The `storage_manager()` accessor functions are also in the same place. `class JobRoot` is now a base class of `class Context`, now split into `ContextBase` and `Context` so that the storage manager member variable is available for the `JobRoot` constructor. `class JobBranch` is now a base class of `class Query` and `class Consolidator`, among others. Rework all the constructors to take a single `JobParent` argument rather than separate arguments for resources, cancellation sources, and storage managers. `JobParent::make_cancellation_source` is now the sole source of `CancellationSource` objects. Add `Context::cancel_all_tasks()`, currently as a proxy for the same function in `StorageManager`. This allowed removal of the accessor `storage_manager()` in the context C API handle. Remove now-unused `tiledb_ctx_handle_t::make_cancellation_source()`.
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Add a job system, a set of base classes for jobs. The job system is generic, with a mixin class to add application-specific behavior. The mixin class for the library deals with
StorageManagerandContextResources, etc. There's only one remainingStorageManagermember variable; it's in the mixin class. Thestorage_manager()accessor functions are also in the same place.Add a registry system centered on
class Registry. The system supports automatic first-pass registration at construction time. This registry is the basic for the tree structure in the job system.class JobRootis now a base class ofclass Context, now split intoContextBaseandContextso that the storage manager member variable is available for theJobRootconstructor.class JobBranchis now a base class ofclass Queryandclass Consolidator, among others. Rework all the constructors to take a singleJobParentargument rather than separate arguments for resources, cancellation sources, and storage managers.JobParent::make_cancellation_sourceis now the sole source ofCancellationSourceobjects. AddContext::cancel_all_tasks(), currently as a proxy for the same function inStorageManager. This allowed removal of the accessorstorage_manager()in the context C API handle. Remove now-unusedtiledb_ctx_handle_t::make_cancellation_source().TYPE: IMPROVEMENT
DESC: Job system for activity tracking