BREAKING CHANGE:
Rework of main perun modules to enable regions.
Deprecated old monitor decorator in favour of 'function monitoring'
Changes to output files, always produces a hdf5, and an optional second file (default text report)

Individual Commits
* wip: created perun class, created singleton decorator, removed backend decorator
* wip: removed _cached_sensors_config from coordination, handled by perun class
* wip: perun class progress, removed decorator
* wip: decorator is back on (sadly), started export command refactoring
* refactor: export command and configuration options (removed depth and raw options)
* refactor: changed api, removed bench prefix, commeted decorator out
* fix: corrections in suprocess and backends
* refactor: return to single file that acumulates everything, but slightly different
* fix: intel_rapl dram max value, wrong overwriting of hdf5 file
* wip: regions
* feat: regions
* fix: overlapping id correction
* refactor: metadata storage
* feat: actual regions
* refactor: io formating
* fix: io fixes
* fix: regions metric units, dependencies
* fix: gpu utilization and memory
* fix: formatting
* fix: missing total run node.
* wip:update docs
* docs: updated docs
* test: updated tests
* ci: appeasing mypy
* [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci
* ci: pydocstyle ignores docs/
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