Rework initialization, improve logging, and other refactoring

[siyangqiu]

📥 Pull Request

📘 Description
This change addresses a number of common pain points with the AgentOps SDK:

• The init() method is expected to be the first entry-point into AgentOps code.
  -- Unexpected behavior is extremely common when this is not the case - often happens because decorators in submodules are called when the submodules are imported.
  -- AgentOps integrations cannot override the default configuration as there is no Client() to set configuration options

• Log messages are suppressed before init() is called. Some warnings messages are not revealed to users as a result

• Errors messages can be confusing. The some errors are split up into multiple logs. Some errors are not descriptive enough because when the issue happens, some information is no longer available

** The Change**

• HTTP Client now throws exceptions so that the calling method can log more descriptive messages
• Improved error messages in general
• The Client() now has "initialized" state variable - only set to true when everything is ready when all required info is provided
• The Client() constructor now only sets default configuration and does not take arguments. Client().configure() is now used to configure the client. init() calls configure() and then initializes the client.

[codecov]

Codecov Report

Attention: Patch coverage is 54.39430% with 192 lines in your changes missing coverage. Please review.

Files	Patch %	Lines
agentops/decorators.py	47.72%	39 Missing and 7 partials ⚠️
agentops/__init__.py	33.33%	31 Missing and 13 partials ⚠️
agentops/client.py	65.48%	28 Missing and 11 partials ⚠️
agentops/session.py	50.76%	20 Missing and 12 partials ⚠️
agentops/config.py	58.33%	15 Missing and 5 partials ⚠️
agentops/http_client.py	40.00%	5 Missing and 1 partial ⚠️
agentops/meta_client.py	0.00%	4 Missing ⚠️
agentops/log_config.py	95.65%	0 Missing and 1 partial ⚠️

Flag	Coverage Δ
unittests	44.91% <54.39%> (+1.80%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
agentops/exceptions.py	80.00% <100.00%> (-1.82%)	⬇️
agentops/helpers.py	72.04% <100.00%> (-1.43%)	⬇️
agentops/log_config.py	96.96% <95.65%> (-3.04%)	⬇️
agentops/meta_client.py	47.36% <0.00%> (-41.21%)	⬇️
agentops/http_client.py	60.71% <40.00%> (-1.79%)	⬇️
agentops/config.py	58.33% <58.33%> (-24.36%)	⬇️
agentops/session.py	60.42% <50.76%> (-11.52%)	⬇️
agentops/client.py	64.58% <65.48%> (+0.41%)	⬆️
agentops/__init__.py	44.82% <33.33%> (-37.44%)	⬇️
agentops/decorators.py	54.00% <47.72%> (-46.00%)	⬇️

[bboynton97]

nits but nothing blocking