chore: add HTS Token Proxy reference contract

[acuarica]

Description:

This PR includes the HTS Token Proxy contract for reference.

Related issue(s):

Fixes #885.

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[github-actions]

Test Results

  16 files  +  3    77 suites  +17   7m 17s ⏱️ + 1m 57s
254 tests +77  247 ✔️ +79  7 💤 ±0  0 ❌  - 2 
263 runs  +75  255 ✔️ +76  8 💤 +1  0 ❌  - 2 

Results for commit c7c9c76. ± Comparison against base commit 8cc3ef8.

This pull request removes 2 and adds 79 tests. Note that renamed tests count towards both.

"before all" hook in "Admin key set to contractId" ‑ TokenManagmentContract Test Suite Extended update token info and keys test suite Admin key set to contractId "before all" hook in "Admin key set to contractId"
"before each" hook for "Should set a new token URI" ‑ @OZERC1155Token Test Suite "before each" hook for "Should set a new token URI"

Should NOT allow a non-operator to transfer tokens to another account ‑ @OZERC1155Token Test Suite Should NOT allow a non-operator to transfer tokens to another account
Should NOT allow a spender to spend hbar on behalf of owner without an allowance grant ‑ @CryptoAllowance Test Suite Should NOT allow a spender to spend hbar on behalf of owner without an allowance grant
Should NOT allow an approval on behalf of hbar owner WITHOUT its signature ‑ @CryptoAllowance Test Suite Should NOT allow an approval on behalf of hbar owner WITHOUT its signature
Should NOT burn insufficient amount of token ‑ @OZERC1155Token Test Suite Should NOT burn insufficient amount of token
Should allow a crypto owner contract account to grant an allowance to a spender contract account to transfer allowance to a receiver on behalf of owner contract account ‑ @CryptoAllowance Test Suite Should allow a crypto owner contract account to grant an allowance to a spender contract account to transfer allowance to a receiver on behalf of owner contract account
Should allow an approval on behalf of hbar owner WITH its signature ‑ @CryptoAllowance Test Suite Should allow an approval on behalf of hbar owner WITH its signature
Should allow an operator to transfer a token to another account ‑ @OZERC1155Token Test Suite Should allow an operator to transfer a token to another account
Should allow an operator to transfer tokens in batch to another account ‑ @OZERC1155Token Test Suite Should allow an operator to transfer tokens in batch to another account
Should burn token in batch ‑ @OZERC1155Token Test Suite Should burn token in batch
Should burn token ‑ @OZERC1155Token Test Suite Should burn token
…

♻️ This comment has been updated with latest results.

[Ivo-Yankov]

LGTM