chore: removing obsolete Provider.create method

[arboleya]

Summary

Quick follow-up after:

• feat!: making provider initialization sync again #3514

Ultimately, the breaking changes were inevitable, so there's no point in keeping a deprecated method.

Checklist

• All changes are covered by tests (or not applicable)
• All changes are documented (or not applicable)
• I reviewed the entire PR myself (preferably, on GH UI)
• I described all Breaking Changes (or there's none)

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[github-actions]

Coverage Report:

Lines	Branches	Functions	Statements
76.95%(+0.01%)	70.41%(+0.06%)	75.01%(+0.04%)	76.95%(+0.01%)

Changed Files:

Ok	File (✨=New File)	Lines	Branches	Functions	Statements
🔴	packages/account/src/providers/provider.ts	68.7% (+0.15%)	56.85% (+0.29%)	70.96% (+0.75%)	68.43% (+0.15%)
🔴	packages/account/src/providers/transaction-request/transaction-request.ts	88.57% (+0%)	78.08% (+1.37%)	84% (+0%)	88.81% (+0%)