Use nullable smallints and tinyints when converting dataframe

[adamsdarlingtower]

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[github-actions]

File	Coverage
All files	42%	❌
plaidcloud/rpc/config.py	51%	❌
plaidcloud/rpc/create_oauth_token.py	27%	❌
plaidcloud/rpc/database.py	33%	❌
plaidcloud/rpc/file_helpers.py	52%	❌
plaidcloud/rpc/functions.py	69%	❌
plaidcloud/rpc/logger.py	62%	❌
plaidcloud/rpc/ratelimiter.py	38%	❌
plaidcloud/rpc/rpc_connect.py	32%	❌
plaidcloud/rpc/type_conversion.py	83%	✅
plaidcloud/rpc/utc.py	76%	✅
plaidcloud/rpc/connection/jsonrpc.py	27%	❌
plaidcloud/rpc/remote/auth.py	77%	✅
plaidcloud/rpc/remote/json_rpc_server.py	15%	❌
plaidcloud/rpc/remote/listener.py	28%	❌
plaidcloud/rpc/remote/rpc_common.py	22%	❌
plaidcloud/rpc/remote/rpc_tools.py	34%	❌

Minimum allowed coverage is 75%

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