chore: add Soroban examples

[cuongph87]

Types of changes

Implements #84

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

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Note

Adds a suite of modular Soroban examples (contracts, tokens, atomic swap, events, TTL, ledger queries, retry config) with shared helpers and Program orchestrator; includes WASM assets and updates project references; removes the old monolithic example.

• Examples (Soroban):
  • Add modular examples: UploadContractExample, CreateContractExample, InvokeContractExample, ExtendContractFootprintTtlExample, GetHealthExample, GetNetworkExample, GetLatestLedgerExample, GetLedgerEntry{Account,ClaimableBalance,ContractCode,ContractData}Example, IncrementContractExample, EventsContractExample, TokenContractExample, AtomicSwapExample.
  • Add helpers: Helpers/SorobanHelpers.cs (server, simulate/poll, ledger key), Helpers/SorobanWasms.cs (WASM paths).
  • Add Program.cs to orchestrate running examples.
  • Remove monolithic Examples/Soroban/SorobanExamples.cs.
• Assets:
  • Include WASM files in output via StellarDotnetSdk.Examples.Soroban.csproj (wasm/*_contract.wasm).
• Build/Deps:
  • Add System.Net.Http and System.Text.RegularExpressions package references to Examples/Horizon, Examples/Soroban, and StellarDotnetSdk projects.

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[jopmiddelkamp]

bugbot run

[Copilot]

Pull request overview

This PR enhances the Soroban examples project by restructuring and expanding the codebase. It refactors the monolithic SorobanExamples.cs file into multiple focused example modules and adds new advanced contract demonstrations including token contracts, atomic swaps, increment contracts, and events contracts.

Key changes:

• Restructured examples into modular, single-responsibility classes
• Added four new advanced contract examples (token, atomic swap, increment, events)
• Introduced shared helper utilities and WASM path constants
• Added package references for System.Net.Http and System.Text.RegularExpressions

Reviewed changes

Copilot reviewed 23 out of 27 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
StellarDotnetSdk/StellarDotnetSdk.csproj	Added System.Net.Http and System.Text.RegularExpressions package references
Examples/Soroban/StellarDotnetSdk.Examples.Soroban.csproj	Added package references and new WASM file configurations
Examples/Soroban/SorobanExamples.cs	Removed monolithic examples file (542 lines deleted)
Examples/Soroban/Program.cs	New orchestrator for all Soroban examples with structured sections
Examples/Soroban/Helpers/SorobanWasms.cs	Constants for WASM file paths
Examples/Soroban/Helpers/SorobanHelpers.cs	Shared helper methods for transaction polling and simulation
Examples/Soroban/Examples/*.cs	Modular example classes for each Soroban operation and contract type
Examples/Horizon/StellarDotnetSdk.Examples.Horizon.csproj	Added System.Net.Http and System.Text.RegularExpressions package references

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