Add @sentry/types and rrweb-snapshot as dev dependencies

This is neccessary to resolve re-exported types referred to by posthog-js' type definitions.

This isn't ideal, but

* We intend to start using sentry anyway
* Discussion with posthog maintainers about rrweb-snapshot at https://github.com/PostHog/posthog-js/issues/252, perhaps we can find another solution soon

package.json

@@ -124,6 +124,7 @@
     "@babel/traverse": "^7.12.12",
     "@matrix-org/olm": "https://gitlab.matrix.org/api/v4/projects/27/packages/npm/@matrix-org/olm/-/@matrix-org/olm-3.2.3.tgz",
     "@peculiar/webcrypto": "^1.1.4",
+    "@sentry/types": "^6.10.0",
     "@sinonjs/fake-timers": "^7.0.2",
     "@types/classnames": "^2.2.11",
     "@types/commonmark": "^0.27.4",
@@ -167,6 +168,7 @@
     "matrix-web-i18n": "github:matrix-org/matrix-web-i18n",
     "react-test-renderer": "^17.0.2",
     "rimraf": "^3.0.2",
+    "rrweb-snapshot": "1.1.7",
     "stylelint": "^13.9.0",
     "stylelint-config-standard": "^20.0.0",
     "stylelint-scss": "^3.18.0",

yarn.lock

@@ -1352,6 +1352,11 @@
     tslib "^2.2.0"
     webcrypto-core "^1.2.0"
 
+"@sentry/types@^6.10.0":
+  version "6.10.0"
+  resolved "https://registry.yarnpkg.com/@sentry/types/-/types-6.10.0.tgz#6b1f44e5ed4dbc2710bead24d1b32fb08daf04e1"
+  integrity sha512-M7s0JFgG7/6/yNVYoPUbxzaXDhnzyIQYRRJJKRaTD77YO4MHvi4Ke8alBWqD5fer0cPIfcSkBqa9BLdqRqcMWw==
+
 "@sinonjs/commons@^1.7.0":
   version "1.8.3"
   resolved "https://registry.yarnpkg.com/@sinonjs/commons/-/commons-1.8.3.tgz#3802ddd21a50a949b6721ddd72da36e67e7f1b2d"
@@ -6841,6 +6846,11 @@ rimraf@^3.0.0, rimraf@^3.0.2:
   dependencies:
     glob "^7.1.3"
 
+rrweb-snapshot@1.1.7:
+  version "1.1.7"
+  resolved "https://registry.yarnpkg.com/rrweb-snapshot/-/rrweb-snapshot-1.1.7.tgz#92a3b47b1112a1b566c2fae2edb02fa48a6f6653"
+  integrity sha512-+f2kCCvIQ1hbEeCWnV7mPVPDEdWEExqwcYqMd/r1nfK52QE7qU52jefUOyTe85Vy67rZGqWnfK/B25e/OTSgYg==
+
 rst-selector-parser@^2.2.3:
   version "2.2.3"
   resolved "https://registry.yarnpkg.com/rst-selector-parser/-/rst-selector-parser-2.2.3.tgz#81b230ea2fcc6066c89e3472de794285d9b03d91"