Staged-primitives

Feat

- **reckoning**: add support for counts dict inputs
- **reckoning**: add support for pauli str inputs
- **reckoning**: add support for pauli phases

Refactor

- **reckoning**: auto cast output to python core numeric types

Perf

- **reckoning**: improve complex abs square computation runtime

Fix

- **reckoning**: compute real valued std_error instead of complex

Feat

- **reckoning**: add support for non-hermitian operators

Fix

- copy metadata to avoid backend.run update by reference bug in Aer

Feat

- **time**: add elapsed time utils
- **reckoning**: reckon observable, pauli and counts in ExpvalReckoner

Refactor

- **reckoning**: clean loop in canonical _reckon method

Feat

- **utils**: add time module and isotimestamp function
- **binary**: add binary_digit util

Refactor

- **operators**: rename operators module to paulis
- **results**: rename results module to counts
- **binary**: change return value in parity_bit to bool

Feat

- **sampler**: add StagedSampler class
- **base**: add BaseStagedSampler
- **estimator**: add StagedEstimator implementation
- **utils.circuits**: add infer_end_layout_intlist
- **utils.results**: add map_counts util
- **utils.results**: add reckoning submodule
- **utils**: add results module
- **utils.operators**: add decomposition submodule
- **utils**: add compose_circuits_w_metadata
- **base**: add BaseStagedEstimator
- **utils**: add operators utils
- **utils**: add circuits utils
- **utils**: add binary utils

Fix

- **results**: use int_outcomes instead of int_raw

Refactor

- **sampler**: simplify _transpile_single_unbound logic
- **estimator**: rearrange init
- **utils.results**: rename mask_counts to bitmask_counts
- **utils.results**: rename counts_list arg in ExpvalReckoner
- **utils.operators**: rename init_observable to normalize_operator
- **base**: remove backend abstractproperty