[FIX] web: pyjs: Tokenize float numbers in scientific notation

Steps to reproduce:

- Install Dashboard, Inventory apps
- Go to Inventory > Products
- Add a custom filter "Quantity on hand > 0.00001"
- Favorites > Add to my dashboard > Add
- Go to dashboard app

Issue:
JS Traceback is raised: `Expected "]", got "(name)"`

When executing the rpc call to `/board/add_to_dashboard`, the number
`0.00001`, which is passed as argument, is decoded as `1e-05` in the
python code and stored in the custom view.

When parsing the same view in the frontend, the tokenizer fails to
detect `1e-05` as a floating number and an error is thrown while parsing.

Solution:
Add regex for floating point numbers in scientific notation in `py.js`.
The regex accepts numbers such as:
- 1.2
- 12.
- .1
- 1e-02
- 1.2E-2
- 12.e+2
- .1E3

opw-3038707

closes odoo/odoo#104828

Signed-off-by: Samuel Degueldre <sad@odoo.com>