Feature/bcss 20517 dynamic css locators (#71)

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## Description

<!-- Describe your changes in detail. -->
Adding a new util to dynamically get input / select locators

## Context

<!-- Why is this change required? What problem does it solve? -->
reduces the clutter of locators in the investigation dataset POM

## Type of changes

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the boxes that apply. -->

- [x] Refactoring (non-breaking change)
- [x] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would change existing
functionality)
- [ ] Bug fix (non-breaking change which fixes an issue)

## Checklist

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that apply. -->

- [x] I am familiar with the [contributing
guidelines](https://github.com/nhs-england-tools/playwright-python-blueprint/blob/main/CONTRIBUTING.md)
- [x] I have followed the code style of the project
- [x] I have added tests to cover my changes (where appropriate)
- [x] I have updated the documentation accordingly
- [ ] This PR is a result of pair or mob programming

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Author: adrianoaru-nhs

docs/utility-guides/DatasetField.md

@@ -0,0 +1,87 @@
+# Utility Guide: Dataset Field Utility
+
+The Dataset Field utility allows for selecting different locators dynamically.<br>
+For example, on the investigation dataset, if we want to select the input locator for the `Start of intubation time` field, we can do this by providing the utility with the name of the field
+
+    DatasetFieldUtil(page).populate_input_locator_for_field(
+        "Start of intubation time", "09:00"
+    )
+
+## Table of Contents
+
+- [Utility Guide: Dataset Field Utility](#utility-guide-dataset-field-utility)
+  - [Table of Contents](#table-of-contents)
+  - [Using the DatasetFieldUtil class](#using-the-datasetfieldutil-class)
+    - [Required Args](#required-args)
+    - [How to use this method](#how-to-use-this-method)
+
+## Using the DatasetFieldUtil class
+
+You can initialise the DatasetFieldUtil class by using the following code in your test file:
+
+    from utils.dataset_field_util import DatasetFieldUtil
+
+This will allow you to use the following methods:
+
+1. populate_input_locator_for_field
+   1. This will allow you to populate the field next to the given text where the type is `input`
+2. populate_select_locator_for_field
+   1. This will allow you to populate the field next to the given text where the type is `select`
+3. populate_input_locator_for_field_inside_div
+   1. This will allow you to populate the field next to the given text where the type is `input`, and inside of a specified container
+4. populate_select_locator_for_field_inside_div
+   1. This will allow you to populate the field next to the given text where the type is `select`, and inside of a specified container
+
+### Required Args
+
+`populate_input_locator_for_field` / `populate_select_locator_for_field`
+
+- text:
+  - Type: `str`
+  - The text of the element you want to interact with.
+- value/option:
+  - Type: `str`
+  - The value or option you want to input / select (depending on what method is called)
+
+`populate_input_locator_for_field_inside_div` / `populate_select_locator_for_field_inside_div`
+
+- text:
+  - Type: `str`
+  - The text of the element you want to interact with.
+- div:
+  - Type: `str`
+  - The ID of the container that the element belongs in.
+- value/option:
+  - Type: `str`
+  - The value or option you want to input / select (depending on what method is called)
+
+### How to use this method
+
+To use this method simply import the DatasetFieldUtil class and call one of the methods, providing the necessary arguments.<br>
+The example below is using options that can be imported from `pages.datasets.investigation_dataset_page`
+
+    from utils.dataset_field_util import DatasetFieldUtil
+    from pages.datasets.investigation_dataset_page import (
+    InsufflationOptions,
+    PolypClassificationOptions,
+    )
+
+    # populate_input_locator_for_field
+    DatasetFieldUtil(page).populate_input_locator_for_field(
+        "End time of procedure", "09:30"
+    )
+
+    # populate_select_locator_for_field
+    DatasetFieldUtil(page).populate_select_locator_for_field(
+        "Insufflation", InsufflationOptions.AIR
+    )
+
+    # populate_input_locator_for_field_inside_div
+    DatasetFieldUtil(page).populate_input_locator_for_field_inside_div(
+        "Estimate of whole polyp size", "divPolypNumber1Section", "15"
+    )
+
+    # populate_select_locator_for_field_inside_div
+    DatasetFieldUtil(page).populate_select_locator_for_field_inside_div(
+        "Classification", "divPolypNumber1Section", PolypClassificationOptions.LS
+    )