Make perf event buffer pageNum configurable instead of hard-coded

[hengyoush]

Currently, the third parameter passed to the following functions in agent.go is hard-coded (for example: 2048, 512, 4, 32):

• PullSyscallDataEvents
• PullSslDataEvents
• PullConnDataEvents
• PullKernEvents

err = bpf.PullSyscallDataEvents(ctx, pm.GetSyscallEventsChannels(), 2048, options.CustomSyscallEventHook)
err = bpf.PullSslDataEvents(ctx, pm.GetSslEventsChannels(), 512, options.CustomSslEventHook)
err = bpf.PullConnDataEvents(ctx, pm.GetConnEventsChannels(), 4, options.CustomConnEventHook)
err = bpf.PullKernEvents(ctx, pm.GetKernEventsChannels(), 32, options.CustomKernEventHook)

This parameter is used to control the size of the perf event buffer (pageNum).

Proposed Changes

1. Add four configuration option (e.g., via command-line flags) to set pageNum for each event type.
2. Replace the current hard-coded values in PullSyscallDataEvents, PullSslDataEvents, PullConnDataEvents, and PullKernEvents calls with a new configuration parameter.
3. Provide sensible default values if no configuration is supplied(2048, 512, 4, 32).

Additional Context

Please add any suggestions or comments below. If you have an implementation idea, feel free to submit a pull request!