Handle meta esdt collection creation

[stefangutica]

Reasoning

• MetaESDT collection properties are served from the cached all-tokens list, which is only rebuilt by the cache warmer every 2 minutes.
• When a meta ESDT is requested for an account, its collection is looked up in that list, and the token is skipped entirely if the collection is not there yet.
• As a result, a freshly created collection and its tokens stay invisible in the API for up to 2 minutes after the registration transaction is confirmed.

Proposed Changes

• Track registerMetaESDT calls to the ESDT contract in the local pending cache, next to the existing issue flow, storing the originating function name.
• Match the smart contract result back to the original transaction: ESDTTransfer@<identifier>@<amount> for issue, @6f6b@<identifier> ("ok") for registerMetaESDT, and resolve the identifier accordingly.
• Extract the shared "fetch the token and append it to the cached token list" logic into a reusable method, with a distinct log line per flow.

How to test

• Register a meta ESDT collection and a meta ESDT token, then immediately query GET /accounts/:address/tokens?includeMetaEsdt=true — the new token should be returned without waiting for the cache warmer.
• GET /tokens/:identifier resolves for the newly registered collection, and the processor logs Detected metaESDT collection creation <identifier>.
• Regression: issue a regular fungible token and confirm it still appears instantly, with the log Detected ESDT token issuance <identifier>.

[github-actions]

k6 load testing comparison.
Base Commit Hash: e7e7203
Target Commit Hash: fa9af1c

Metric	Base				Target				Diff
	Avg	Max	90	95	Avg	Max	90	95	Avg	Max	90	95
Mex	24.08	258.14	35.70	37.96	46.83	485.59	59.57	62.05	+94.46% 🔴	+88.11% 🔴	+66.87% 🔴	+63.46% 🔴
Nodes	24.08	261.84	35.75	38.07	46.78	423.43	59.55	62.08	+94.28% 🔴	+61.71% 🔴	+66.58% 🔴	+63.04% 🔴
Transactions	28.51	1954.20	36.19	38.50	58.33	2407.86	60.83	64.13	+104.56% 🔴	+23.21% 🔴	+68.07% 🔴	+66.57% 🔴
Accounts	25.85	1030.19	35.64	37.90	48.98	1408.02	59.94	62.20	+89.47% 🔴	+36.68% 🔴	+68.17% 🔴	+64.13% 🔴
Tokens	24.09	261.91	35.71	38.06	46.75	223.45	59.74	62.15	+94.10% 🔴	-14.68% ✅	+67.29% 🔴	+63.31% 🔴
Pool	24.10	262.37	35.63	37.98	46.96	446.02	59.65	62.08	+94.85% 🔴	+70.00% 🔴	+67.39% 🔴	+63.43% 🔴
Blocks	29.69	990.87	36.46	39.01	58.72	1068.07	60.92	63.95	+97.77% 🔴	+7.79% 🔴	+67.10% 🔴	+63.93% 🔴
Test Run Duration	60001.52				60002.79

Legend: Avg - Average Response Time, Max - Maximum Response Time, 90 - 90th Percentile, 95 - 95th Percentile
All times are in milliseconds.