feat: Upgrade to rrweb2

[billyvg]

Brings this library up to date w/ upstream. Includes additional commits for enhanced privacy and Sentry release workflows.

Cherry picks include the following upstream PRs:

• https://github.com/rrweb-io/rrweb/issues/1096
• https://github.com/rrweb-io/rrweb/pull/1155
• https://github.com/rrweb-io/rrweb/pull/1257
• https://github.com/rrweb-io/rrweb/pull/1262

Cherry picks from getsentry fork:

• https://github.com/getsentry/rrweb/pull/70
• https://github.com/getsentry/rrweb/pull/103
• https://github.com/getsentry/rrweb/pull/103/commits/064d8c4e66c6ae3e1e2e25f226e6e3667e3d6cb4
• https://github.com/getsentry/rrweb/pull/103/commits/e274f88d666a9985e51ec558c14e1d5a44d34a12
• https://github.com/getsentry/rrweb/pull/103/commits/cffefa29646be2a88fdd8b38584647c0174d9748
• https://github.com/getsentry/rrweb/pull/20

[billyvg]

I renamed the old sentry-v2 branch and recreated it from master and made it the default branch. Will use this PR to squash changes to a single commit - I think that'll be easier to maintain in the long run.