Vault + Restaking: Replace withdrawal_asset instruction with delegate_token_account

[aoikurokawa]

Motivation

• Closes #41
• Closes #42

Solution

• Modify delegate_token_account in vault_program
• Modify ncn_delegate_token_account in restaking_program
• Modify operator_delegate_token_account in restaking_program

[aoikurokawa]

@buffalu Can you review for it?

[buffalu]

@buffalu Can you review for it?

some conflicts you need to resolve! sorry :)

[aoikurokawa]

@buffalu Thank you for reviewing!! I made a new load_token_2022_program.

[aoikurokawa]

@buffalu Thank you so much for review!!

[aoikurokawa]

@buffalu It's ready for review!!

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 83.79888% with 58 lines in your changes missing coverage. Please review.

Project coverage is 81.89%. Comparing base (c310925) to head (0e77dcd). Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
restaking_core/src/operator.rs	55.55%	16 Missing :warning:
core/src/loader.rs	70.00%	15 Missing :warning:
restaking_core/src/ncn.rs	57.14%	15 Missing :warning:
vault_program/src/delegate_token_account.rs	93.33%	4 Missing :warning:
...estaking_program/src/ncn_delegate_token_account.rs	96.15%	2 Missing :warning:
restaking_program/src/ncn_set_secondary_admin.rs	0.00%	2 Missing :warning:
...ing_program/src/operator_delegate_token_account.rs	96.15%	2 Missing :warning:
vault_core/src/vault.rs	89.47%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #49 +/- ## ========================================== + Coverage 79.42% 81.89% +2.47% ========================================== Files 85 85 Lines 8456 8579 +123 ========================================== + Hits 6716 7026 +310 + Misses 1740 1553 -187 ```

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