[IMP] survey: allow more question type scoring

### PURPOSE

Support correct answers, scoring mechanism, and demo data on additional question types:
- Numerical Value
- Date
- Datetime

Additional improvements and fixes include:
- When checking answer type, add in check to allow 0 as a valid survey answer to a question of type Numerical Value.
-  Include "most common" tab for question type Date in results page.
- Do not show skipped answer (i.e. blank User Response value) rows in results page tables (for results of non-choice questions).

### SPECIFICATIONS

**New question types scoring:**

Previously only the question_types: 'simple_choice' and 'multiple_choice' could be scored and have a "correct" answer(s). This change makes it so that question_types: 'numerical_box', 'date', and 'datetime' can also have a "correct" answer and an associated 'answer_score'. Some restructuring of scoring logic was required in order to accommodate and better streamline new question_types scoring.

Demo and testing data also added for these new scorable question types. New demo data includes both scored and unscored (i.e. answer_score = 0) instances for the 3 question types to ensure differing behavior is viewable in survey results. During this update, errors in existing demo data were fixed when discovered. The same demo data additions/updates were duplicated in the relevant tests.

**Additional improvements/fixes:**

- Answer type check: additional conditional needed to handle 0 evaluating to False even though it is a valid entry as a numerical value.
- "most common" tab added only for Date since it is currently not expected to be useful for Datetime questions. Implementation is left generic for future additional question types scoring implementations.
- Skipped answers were shown either as a blank value for Date, Datetime, Multiple Line Text Box, Single Line Text Box or 0.0 for Numerical Value question types. A simple check to skip these skipped lines from being shown in the results page is all that is needed.
- Light rewriting of question form view to include answer-related options and choices directly in the "Answer" tab.

LINKS

Upgrade PR: odoo/upgrade#835
Task ID: 2061937

closes odoo/odoo#43014

Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

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