feat: Add hexadecimal numerical notation #1359

Job	Run time
rules	4s
publish-web	0s
lint-megalinter / lint-megalinter	6m 57s
test-js	0s
test-python	0s
test-dotnet	0s
test-elixir	0s
test-java	0s
test-php	0s
check-links-book	0s
check-links-markdown	36s
nightly	0s
test-lib	0s
test-rust-main	0s
test-taskfile	0s
build-prqlc (ubuntu-latest, x86_64-unknown-linux-musl)	1m 21s
measure-code-cov	0s
build-prqlc (macos-latest, x86_64-apple-darwin, test-dbs)	2m 27s
push-devcontainer	0s
build-prqlc (windows-latest, x86_64-pc-windows-msvc)	2m 50s
test-devcontainer	0s
test-grammars	0s
test-msrv	0s
time-compilation	0s
build-web / build-web	8m 34s
test-rust (wasm32-unknown-unknown, ubuntu-latest) / test-rust	1m 28s
test-rust (x86_64-unknown-linux-gnu, ubuntu-latest, test-dbs-external) / test-rust	5m 14s
check-ok-to-merge	8s
create-issue-on-nightly-failure	0s
	29m 39s

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