Update .gitignore and add/remove Cargo.lock when appropriate (delta-io#1001)

# Description
1. Add to `.gitignore` so that all `Cargo.lock` files except for the
ones in the listed binary crates are ignored.
2. Add `Cargo.lock` to the proofs crate since it is binary.
3. Remove `Cargo.lock` from the root directory.

# Related Issue(s)
Closes delta-io#1000

Author: iajoiner

.gitignore

@@ -17,3 +17,11 @@ tlaplus/*.toolbox/*/[0-9]*-[0-9]*-[0-9]*-[0-9]*-[0-9]*-[0-9]*/
 *.env
 __azurite*
 __blobstorage__
+.githubchangeloggenerator*
+
+# Add all Cargo.lock files except for those in binary crates
+Cargo.lock
+!/aws/delta-checkpoint/Cargo.lock
+!/delta-inspect/Cargo.lock
+!/proofs/Cargo.lock
+