ESPmDNS: Add method for querying discovered service name

[stefan-sherwood]

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Description of Change

Please describe your proposed Pull Request and it's impact.

Added method for getting service (instance) name of services discovered with mDNS

Tests scenarios

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I have tested my Pull Request on Arduino-esp32 core v2.02 with ESP32 Dev board

(eg. I have tested my Pull Request on Arduino-esp32 core v2.0.2 with ESP32 and ESP32-S2 Board with this scenario)

Related links

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[github-actions]

Warnings

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Some issues found for the commit messages in this PR: the commit message "Add method for querying service name": summary looks empty type/action looks empty the commit message "Added implementation for getting service name": summary looks empty type/action looks empty the commit message "Update mDNS-SD_Extended example to include service name": summary looks empty type/action looks empty Please fix these commit messages - here are some basic tips: follow Conventional Commits style correct format of commit message should be: <type/action>(<scope/component>): <summary>, for example fix(esp32): Fixed startup timeout issue allowed types are: change,ci,docs,feat,fix,refactor,remove,revert,test sufficiently descriptive message summary should be between 10 to 72 characters and start with upper case letter avoid Jira references in commit messages (unavailable/irrelevant for our customers) TIP: Install pre-commit hooks and run this check when committing (uses the Conventional Precommit Linter).

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[github-actions]

Memory usage test (comparing PR against master branch)

The table below shows the summary of memory usage change (decrease - increase) in bytes and percentage for each target.

Memory	FLASH [bytes]		FLASH [%]		RAM [bytes]		RAM [%]
Target	DEC	INC	DEC	INC	DEC	INC	DEC	INC
ESP32P4	0	‼️ +18K	0.00	‼️ +2.72	0	0	0.00	0.00
ESP32S3	0	⚠️ +376	0.00	⚠️ +0.04	0	0	0.00	0.00
ESP32S2	0	⚠️ +376	0.00	⚠️ +0.04	0	0	0.00	0.00
ESP32C3	0	‼️ +20K	0.00	‼️ +2.18	0	0	0.00	0.00
ESP32C6	0	‼️ +20K	0.00	‼️ +2.13	0	0	0.00	0.00
ESP32	0	⚠️ +372	0.00	⚠️ +0.04	0	0	0.00	0.00

Click to expand the detailed deltas report [usage change in BYTES]

Target	ESP32P4		ESP32S3		ESP32S2		ESP32C3		ESP32C6		ESP32
Example	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM
ESPmDNS/examples/mDNS-SD_Extended	‼️ +16K	0	⚠️ +376	0	⚠️ +376	0	‼️ +18K	0	‼️ +18K	0	⚠️ +372	0
ESPmDNS/examples/mDNS_Web_Server	‼️ +18K	0	⚠️ +284	0	⚠️ +276	0	‼️ +20K	0	‼️ +20K	0	⚠️ +284	0

[github-actions]

Test Results

 62 files   62 suites   5m 41s ⏱️
 21 tests  21 ✅ 0 💤 0 ❌
154 runs  154 ✅ 0 💤 0 ❌

Results for commit 25658e9.

♻️ This comment has been updated with latest results.