(EAI-598) [UI] Investigate further code splitting

[nlarew]

Jira: (EAI-598) [UI] Investigate further code splitting

Changes

• Adds some additional code splitting & lazy loading to some components inside of the chat window view
• Note the build output includes more, smaller, chunks. There is still some significant heft to the Message component that I think comes from the LG Chat markdown. Need to look upstream for a fix there.

Before (current main):

...
build/es/ConversationProvider.js            67.30 kB │ gzip:  16.89 kB
build/es/lodash.js                         121.75 kB │ gzip:  30.95 kB
build/es/index3.js                         173.01 kB │ gzip:  35.20 kB
build/es/index7.js                         181.52 kB │ gzip:  54.19 kB
build/es/messageLinks.js                   210.30 kB │ gzip:  41.70 kB
build/es/index2.js                         313.03 kB │ gzip:  83.32 kB
build/es/ui-text.js                        328.27 kB │ gzip:  66.02 kB
build/es/ChatWindow.js                   2,060.51 kB │ gzip: 418.91 kB
✓ built in 5.17s

After (this PR):

...
build/es/ConversationProvider.js            67.33 kB │ gzip:  16.89 kB
build/es/ChatWindow.js                      75.68 kB │ gzip:  13.25 kB
build/es/ChatMessageFeed.js                 77.13 kB │ gzip:  16.42 kB
build/es/lodash.js                         120.77 kB │ gzip:  30.56 kB
build/es/index13.js                        131.94 kB │ gzip:  44.06 kB
build/es/index6.js                         160.88 kB │ gzip:  31.62 kB
build/es/index15.js                        202.81 kB │ gzip:  39.37 kB
build/es/InputBar.js                       305.09 kB │ gzip:  61.32 kB
build/es/index2.js                         313.00 kB │ gzip:  83.31 kB
build/es/MessageRating.js                  612.44 kB │ gzip: 116.19 kB
build/es/MessageContent2.js              1,201.38 kB │ gzip: 262.81 kB
✓ built in 5.02s