[IMP] *: script-safe JSON serialisation

* add a json_scriptsafe module, which re-exports the stdlib's json but
provides a script-safe `dumps` function, because of the way it works
the script-safe version is fine / safe to use outside script
contexts, so there's no need to provide different functions to qweb
contexts
* make the json.dumps in qweb contexts <script>-safe (should be
rendered using t-raw)
* update callsites to properly dump json:
- dump in template, not in the python code
- dump the entire structure at once, not bits and bobs inside a JSON
literal

Task 1999158

closes odoo/odoo#33682

Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>

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