v0.21.0

What's Changed

• fix(functions): stop cancelling finished handlers when the stream closes by @Albert-Gao in #51
• docs(providers): describe the Provider credential and endpoint in create() by @Albert-Gao in #52
• feat(sdk)!: type Agent tools as individually toggled tool names by @Albert-Gao in #53
• chore(release): bump Python SDK to 0.21.0 by @Albert-Gao in #54

Full Changelog: v0.20.0...v0.21.0