This change vendors textobjects.scm files from the

nvim-treesitter-textobjects repository (Apache-2.0, same org as

nvim-treesitter) as interesting_lines.scm, filtered down to the patterns

capturing @function.outer and @class.outer. These will drive

tree-sitter-based interesting lines detection in the diff viewer,

covering 49 languages.
update-queries.py now takes a second argument pointing to a

nvim-treesitter-textobjects checkout, and processes each vendored file

from a per-file source spec (repository, queries path, source URL,

input/output filenames, and an optional transform). The existing

inherits resolution, commit-history fallback, and grammar validation

apply to both repositories, with transforms applied before validation so

we validate what we ship.
The textobjects transform (query_utils.filter_query_patterns) keeps

only patterns using the captures we want, drops the comments attached to

dropped patterns, dedupes patterns duplicated by inherits resolution

(javascript pulls ecma in twice), and drops per-language wrapper

patterns that would yield the wrong header line (a decorated Python

definition would report the first decorator line; the plain

function_definition pattern already yields the def line).
Each vendored file is recorded in queries.lock with the textobjects

repository URL and commit. Upstream has no usable function or class

captures for some languages (such as perl), which simply do not get an

interesting_lines.scm and will fall back to the regex scanner.
The actual vendored files are part of my commit but I've excluded them

from the posted change here.

Ran update-queries.py against fresh checkouts of both repositories,

  with nvim-treesitter pinned to the queries.lock commit. The existing

  highlights.scm and injections.scm files regenerated byte-identical.
Added a test compiling every vendored interesting_lines.scm against

  its grammar, plus unit tests for filter_query_patterns().
Spot-checked the vendored output for Python, JavaScript, TypeScript,

  C, and C++.
Ran unit tests (reviewboard/treesitter).