[MOV] crm_iap_mine: reorganize and guidelinize addon

PURPOSE

Perform a global renaming / cleaning of IAP features often added or merged
with minimal review. Time to cleanup !

SPECIFICATIONS

Reorganize module according to guidelines. Notably correctly name files,
split python fiels and views according to their model, split some data
to ease module organization and understanding.

Perform some code re-ordering in some big files in order to have code clearly
separated by main usage and ease future changes.

Quickly lint or update some view or record names.

LINKS

Task-2630969
Prepares Task-2600047 (code improvements and cleaning)
COM PR odoo/odoo#75514
ENT PR odoo/enterprise#20424
UPG PR odoo/upgrade#2770