🚑 Remove sync methods blocking main thread on Unity

[GabrielePicco]

Status	Type	⚠️ Core Change	Issue
Ready	Hotfix	Yes	-

Problem

Many synch version of async methods are blocking the main thread on Unity.

See https://stackoverflow.com/questions/14526377/why-does-this-async-action-hang-when-i-try-and-access-the-result-property-of-my for more details on the issue.

Solution

Since sync over async is not generally a good design pattern, removed the sync version of the methods

[coveralls]

Pull Request Test Coverage Report for Build 4248196115

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 2 of 4 (50.0%) changed or added relevant lines in 2 files are covered.
• 144 unchanged lines in 7 files lost coverage.
• Overall coverage decreased (-2.1%) to 73.193%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/Solana.Unity.Extensions/TokenWallet.cs	0	2	0.0%

Files with Coverage Reduction	New Missed Lines	%
src/Solana.Unity.Rpc/Builders/MessageBuilder.cs	1	93.1%
src/Solana.Unity.Extensions/Models/TokenMint/TokenDef.cs	7	74.55%
src/Solana.Unity.Extensions/Models/TokenWallet/TokenWalletAccount.cs	8	0.0%
src/Solana.Unity.Extensions/Models/TokenWallet/TokenWalletBalance.cs	8	0.0%
src/Solana.Unity.Extensions/Models/TokenWallet/TokenWalletFilterList.cs	13	0.0%
src/Solana.Unity.Rpc/Core/Http/JsonRpcClient.cs	19	62.64%
src/Solana.Unity.Extensions/TokenWallet.cs	88	0.0%

Totals
Change from base Build 4225337871:	-2.1%
Covered Lines:	4717
Relevant Lines:	6141

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💛 - Coveralls