fix(javascript): enable cache

[Haroenv]

🧭 What and Why

cacheable is already a key in the transporter's Request interface, but no method actually set it before now

🎟 JIRA Ticket: APIC-503

Changes included:

• set cacheable: true in the mustache for JS if in the yaml
• set x-cacheable to the cacheable requests (same as "useReadTransporter")

🧪 Test

search no longer does two requests if you do it twice (in combination with #611

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[millotp]

So fast ! thank you !
What do you use to determine if a requests is cacheable or not ? Do we have a list somewhere ?

[Haroenv]

I used the same list as the ones that have "useReadTransporter", which are all POST. Not sure if the other GET ones should be cached as well, you can compare with v4 here: https://github.com/algolia/algoliasearch-client-javascript/search?q=cacheable%3A+true

[Haroenv]

I'd say it's only urgent for the requests commonly used frontend (search, recommend)