Support option.version for resources and invokes

This PR brings 2 improvements:

Commits https://github.com/pulumi/pulumi-lsp/commit/daa52b79eac7a0e46349d2e1a38b3018f652cb22 and https://github.com/pulumi/pulumi-lsp/commit/edab9e01bcd1d6fd12b5ad9355ec9c4b6c3e8eb2 force the LSP server to take the version field into account when retrieving packages.
Commits 3b2a30de41929d48e3deafa32c999c89d9a9d346, 21dc9314a8d6341d52ac3e4e3ff92144f2c1a30d, 1a9925ec4de5bcb7a0f18e078e2e3336fb7bc9bb and 9ca3cf1e44d7666c9ae74d105392b76526b02a90 improve completion so it only triggers when typing in the correct field (instead of the whole line).

Fixes #50

pulumi / pulumi-lsp