[IMP] account, l10n_eg_edi_eta: moved L10nEgHTTPAdapter to account

For task-3347812, we needed to create the same Adapter used in l10n_eg_edi_eta. Moving the adapter to account.tools allows us to reuse the same class in different modules.

closes odoo/odoo#125161

Related: odoo/enterprise#40936
Signed-off-by: Quentin De Paoli <qdp@odoo.com>