Breaking changes in v2.0.0

[winder]

Itemizes functionality that will be removed in the upcoming major release.

Task list for algorand-sdk-testing stories:

• Deprecation follow up: Remove DryrunTxnResult.cost algorand-sdk-testing#201 - v2: Update model for dryrun to delete deprecated cost field #444
• Deprecation follow up: Remove mapping from CompileResponse.sourcemap algorand-sdk-testing#202 - N/A
• Deprecation follow up: Remove langspec.json-related resources algorand-sdk-testing#223 - v2: Delete langspec and templates #445
• Remove logicsig templates from SDKs algorand-sdk-testing#254 - v2: Delete langspec and templates #445
• SDKs: Drop algod v1 REST API support  algorand-sdk-testing#255 - v2: Delete v1 algod endpoints and models #451
• Generator does not delete files for items removed from API spec generator#46 - Clean previously generated files before generation for generator_go.sh generator#47
• v2: mark MakeLogicSigAccount private and delete related functions #450