CRS-293 Max attachments

[ath92]

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Description of the pull request

Draft: relies on GetStream/react-file-utils#22. Relates to #565

This PR uses channelContext.maxNumberOfFiles to prevent the user from uploading too many files. It does so by doing two things:

• setting the maxNumberOfFiles prop in ImageDropzone (part of react-file-utils)
• disabling the file upload button if needed

Other fixes:

• Removing while uploading no longer throws
• if channelContext.multipleUploads is set to false, you can now only upload a single file (and its default value is now true)

To do:

• Get translations for tooltip ("You've reached the maximum number of files")
• UI indication in ImageDropzone, when attempting to drop more than the allowed number of files (in react-file-utils)

[github-actions]

Size Change: +6.83 kB (0%)

Total Size: 1.26 MB

Filename	Size	Change
./dist/browser.full-bundle.js	644 kB	+4.52 kB (0%)
./dist/browser.full-bundle.min.js	372 kB	+908 B (0%)
./dist/css/index.css	23 kB	+36 B (0%)
./dist/i18n/en.json	824 B	+34 B (4%)
./dist/i18n/fr.json	1.25 kB	+45 B (3%)
./dist/i18n/hi.json	1.43 kB	+59 B (4%)
./dist/i18n/it.json	1.19 kB	+49 B (4%)
./dist/i18n/nl.json	1.17 kB	+54 B (4%)
./dist/i18n/ru.json	1.47 kB	+70 B (4%)
./dist/i18n/tr.json	1.19 kB	+49 B (4%)
./dist/index.es.js	105 kB	+511 B (0%)
./dist/index.js	107 kB	+498 B (0%)

ℹ️ View Unchanged

Filename	Size	Change
./dist/css/index.js	21 B	0 B

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[jaapbakker88]

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