Allow filtering of Excel service data

[iSOLveIT]

The idea is to enable users to filter the Excel data imported according to their needs. An example in the documentation could look like this:

.. needservice:: Excel
   :query: type == 'req' and status in ['open', 'reopen']

Tasks

• [x] Provide a query option (directive and conf.py)
• [x] Filter Excel rows based on this query
• [x] Documentation
• [x] Tests - (named as test_excel_filter())

Mechanism used

• Created a function called filter_excel_data(context: list[dict], filter_string: str) -> list[dict] that filters the data imported from Excel and returns the filtered version.
• Inside the function, we use the eval() to evaluate the given filter string in the context (i.e. dict object of the data imported) like this, eval('filter_string', {}, data_imported).
• If the evaluation is true, we add the data_imported to a list of filtered data and then return it.

[iSOLveIT]

Yeah I am finding out why CI fails

[iSOLveIT]

Let me work out the CI issues first. Thanks