release: server 0.4.0 and widget 0.4.4, custom conversation stores, maxTokens and screen reader support

[anurag629]

Brings everything on dev to production. Once this is merged, changesets opens the version PR: server 0.4.0, widget 0.4.4 and core 0.3.2.

Server (minor)

• conversationStore option to plug in your own store, so conversations survive restarts and multiple instances (feat(server): allow configuring custom conversationStore (#114) #163, thanks @bhushan4work)
• maxTokens and temperature in the server config (feat(server): add maxTokens and temperature to the server config #162, thanks @prakashNalla)
• 400 and 405 responses carry the CORS header, so cross-origin pages can read them (fix(server): send CORS header with 400 and 405 error responses #166, thanks @piyusshhjangid)
• Regenerate works when the server lost the conversation, and a retry doesn't add the message twice (fix(server): restore user message when regenerating without one (#116) #165, thanks @bhushan4work)
• The i18n option, which the server never read, is deprecated and logs a warning (fix(server): deprecate the i18n option the server never reads #161, thanks @prakashNalla)

Widget (patch)

• Screen readers announce new messages and the typing indicator (fix(widget): announce new messages and the typing indicator to screen readers #153, thanks @prakashNalla)
• All UI text and aria-labels moved into locale strings (fix(widget): move hardcoded UI text to locale strings #150, thanks @anurag2787)
• Pre-chat answers are saved and sent with every request (fix(widget): persist pre-chat userData and send with every request (#113) #155, thanks @bhushan4work)
• The timeout resets while a reply streams, so long answers can finish; set it with timeout (fix(widget): use a configurable streaming inactivity timeout #164, thanks @Pratham2511)

Core (patch)

• Spanish, French and German strings now use the right accents, and the Hindi locale is written in Devanagari (fix(core): add missing accents to es/fr/de locales, write Hindi in Devanagari #167, thanks @harshit-exe-dev)

Also on dev: proxy-addr 2.0.8 (#152), the encoding check in CI (#156), docs updates (#151, #157).

dev is 14 commits ahead of production and nothing behind, so this merges cleanly.

Thanks to everyone who contributed this round. Come hang out with us on Discord: https://discord.gg/mpGdJyjaRQ