[SIGMON-299] Backwards compatible QueryBuilder

Context

• Main goal of the task was to reimplement QueryBuilder using lhcsmapi.api.query to validate the latter
• task: https://its.cern.ch/jira/browse/SIGMON-299
• lhc-sm-hwc MR: lhc-sm-hwc!103 (merged)

What was done

• old builders from pyedsl removed
• new (simplified) QueryBuilder implemented in lhcsmapi.api.query_builder - supports only those 'paths' which are actually used
• hacks to support the old QueryBuilder removed from signal_metadata
• small refactoring of query.py (+ outputs unified but this is continued by SIGMON-341)
• signal is sanitized: (0-valued, duplicated or non-monotonic indices are being removed now)
• query_raw_pm_data that returns a Dict with the PM payload was written
• PcQuery#query_pc_pm_events were rewritten using query_raw_pm_data

TODO

• integrate with https://its.cern.ch/jira/browse/SIGMON-341

QA

• sonar: http://sonar.cern.ch/dashboard?branch=SIGMON-299_backwards_compatible_query_builder&id=lhc-sm-api
• code was unit tested
• notebooks were adapted and are passing:

Review objectives

• ? assessment of code functionality
• ? assessment of code quality
• ? identifying potential refactorings / logic common to other projects
• ? knowledge sharing
• ? getting help to understand a piece of code