Update anchor parser to map account names and pubkeys

[isaacsolo]

Description

Update anchor parser to map account names to their pubkeys and restructure anchor_parser to be a class that has an InstructionCoder. This will help with getting account pubkeys in indexing.

Fixes ASI-1025.

Tests

Tested manually and verified in mapping in logs.

{'instructions': [{'instruction_name': 'init_admin', 'accounts': (OrderedDict([('admin', 'FgJunUE6VhQ3XqaktoM3jt9JQb2fuQcR18NFi68Zn4JG'), ('payer', '6PFePteV78tkfnbTQ9TkNboXG8pWXTVHRsHLp2446uJv'), ('systemProgram', '11111111111111111111111111111111')]), ['FgJunUE6VhQ3XqaktoM3jt9JQb2fuQcR18NFi68Zn4JG', '6PFePteV78tkfnbTQ9TkNboXG8pWXTVHRsHLp2446uJv', '11111111111111111111111111111111']), 

How will this change be monitored? Are there sufficient logs?

No monitoring.

[csjiang]

Nice! Thanks for doing this work. Looks really good!

[hareeshnagaraj]

LGTM!

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3086103	Generic High Entropy Secret	392ea76	discovery-provider/integration_tests/tasks/test_anchor_program_indexer.py	View secret

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