Implement querier

[sashacmc]

Implement querier API to allow optimize consequenced queries.

New type:

• z_[owned|loaned|moved]_querier_t

New methods:

• z_declare_querier
• z_undeclare_querier
• z_querier_get
• z_querier_keyexpr
• z_querier_options_default
• z_querier_get_options_default

New example:

• z_querier

Z_FEATURE_PUBLISHER_SESSION_CHECK was renamed to Z_FEATURE_SESSION_CHECK for use it with querier too

[github-actions]

PR missing one of the required labels: {'dependencies', 'enhancement', 'breaking-change', 'new feature', 'documentation', 'bug', 'internal'}

[github-actions]

PR missing one of the required labels: {'internal', 'documentation', 'new feature', 'enhancement', 'dependencies', 'breaking-change', 'bug'}