v1.14: [zk-token-sdk] rename and restructure CloseAccount and WithdrawWithheld proof instructions (backport of #31608)

[mergify]

This is an automatic backport of pull request #31608 done by Mergify.
Cherry-pick of f9b0691 has failed:

On branch mergify/bp/v1.14/pr-31608
Your branch is up to date with 'origin/v1.14'.

You are currently cherry-picking commit f9b0691eb4.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   programs/zk-token-proof-tests/tests/process_transaction.rs
	new file:   zk-token-sdk/src/instruction/ctxt_ctxt_equality.rs
	modified:   zk-token-sdk/src/instruction/mod.rs
	modified:   zk-token-sdk/src/instruction/pubkey_validity.rs
	modified:   zk-token-sdk/src/instruction/transfer.rs
	modified:   zk-token-sdk/src/instruction/transfer_with_fee.rs
	modified:   zk-token-sdk/src/instruction/withdraw.rs
	new file:   zk-token-sdk/src/instruction/zero_balance.rs
	renamed:    zk-token-sdk/src/sigma_proofs/equality_proof.rs -> zk-token-sdk/src/sigma_proofs/ctxt_comm_equality_proof.rs
	new file:   zk-token-sdk/src/sigma_proofs/ctxt_ctxt_equality_proof.rs
	modified:   zk-token-sdk/src/sigma_proofs/mod.rs
	modified:   zk-token-sdk/src/sigma_proofs/pubkey_proof.rs
	modified:   zk-token-sdk/src/sigma_proofs/zero_balance_proof.rs
	modified:   zk-token-sdk/src/zk_token_elgamal/convert.rs
	modified:   zk-token-sdk/src/zk_token_elgamal/pod.rs
	modified:   zk-token-sdk/src/zk_token_proof_instruction.rs

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	both modified:   programs/zk-token-proof/src/lib.rs
	deleted by them: zk-token-sdk/src/instruction/close_account.rs
	deleted by them: zk-token-sdk/src/instruction/withdraw_withheld.rs

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

---

Mergify commands and options

More conditions and actions can be found in the documentation.

You can also trigger Mergify actions by commenting on this pull request:

• @Mergifyio refresh will re-evaluate the rules
• @Mergifyio rebase will rebase this PR on its base branch
• @Mergifyio update will merge the base branch into this PR
• @Mergifyio backport <destination> will backport this PR on <destination> branch

Additionally, on Mergify dashboard you can:

• look at your merge queues
• generate the Mergify configuration with the config editor.

Finally, you can contact us on https://mergify.com

[codecov]

Codecov Report

Merging #31704 (47d8bf4) into v1.14 (e54bd6d) will decrease coverage by 0.1%.
The diff coverage is 80.3%.

@@            Coverage Diff            @@
##            v1.14   #31704     +/-   ##
=========================================
- Coverage    82.1%    82.1%   -0.1%     
=========================================
  Files         664      665      +1     
  Lines      185210   185216      +6     
=========================================
+ Hits       152156   152157      +1     
- Misses      33054    33059      +5