Increase the payload size to SNAPLEN when events can be merged

[dxsup]

Description

Increase the limited payload size to SNAPLEN when events can be merged. This PR fixes the bug that the payload size is limited to 80 if one request/response is combined by multiple events.

Related Issue

This is the subsequent to #393 to fix #388.

How Has This Been Tested?

=== RUN   TestHttpProtocol
=== RUN   TestHttpProtocol/slowData
=== RUN   TestHttpProtocol/errorData
=== RUN   TestHttpProtocol/split
=== RUN   TestHttpProtocol/normal
=== RUN   TestHttpProtocol/continueData
--- PASS: TestHttpProtocol (0.00s)
    --- PASS: TestHttpProtocol/slowData (0.00s)
    --- PASS: TestHttpProtocol/errorData (0.00s)
    --- PASS: TestHttpProtocol/split (0.00s)
    --- PASS: TestHttpProtocol/normal (0.00s)
    --- PASS: TestHttpProtocol/continueData (0.00s)
=== RUN   TestMySqlProtocol
=== RUN   TestMySqlProtocol/query-split
=== RUN   TestMySqlProtocol/query
--- PASS: TestMySqlProtocol (0.00s)
    --- PASS: TestMySqlProtocol/query-split (0.00s)
    --- PASS: TestMySqlProtocol/query (0.00s)
=== RUN   TestRedisProtocol
=== RUN   TestRedisProtocol/get
--- PASS: TestRedisProtocol (0.00s)
    --- PASS: TestRedisProtocol/get (0.00s)
=== RUN   TestDnsProtocol
=== RUN   TestDnsProtocol/multi
--- PASS: TestDnsProtocol (0.00s)
    --- PASS: TestDnsProtocol/multi (0.00s)
=== RUN   TestKafkaProtocol
=== RUN   TestKafkaProtocol/produce-split
=== RUN   TestKafkaProtocol/fetch-split
=== RUN   TestKafkaProtocol/fetch-one-topic-two-patitions
--- PASS: TestKafkaProtocol (0.00s)
    --- PASS: TestKafkaProtocol/produce-split (0.00s)
    --- PASS: TestKafkaProtocol/fetch-split (0.00s)
    --- PASS: TestKafkaProtocol/fetch-one-topic-two-patitions (0.00s)
=== RUN   TestDubboProtocol
=== RUN   TestDubboProtocol/shortData
--- PASS: TestDubboProtocol (0.00s)
    --- PASS: TestDubboProtocol/shortData (0.00s)
=== RUN   TestRocketMQProtocol
=== RUN   TestRocketMQProtocol/rocketmq-json
=== RUN   TestRocketMQProtocol/rocketmq-rocketmq
=== RUN   TestRocketMQProtocol/rocketmq-error
--- PASS: TestRocketMQProtocol (0.00s)
    --- PASS: TestRocketMQProtocol/rocketmq-json (0.00s)
    --- PASS: TestRocketMQProtocol/rocketmq-rocketmq (0.00s)
    --- PASS: TestRocketMQProtocol/rocketmq-error (0.00s)
PASS

[dxsup]

Also, this PR fixes the potential bug hiding in the test cases of networkanalyzer. I have redesigned the data format used to declare the data field of events.

Check details in collector/pkg/component/analyzer/network/network_analyzer_test.go.

// getData converts the following format to byte array.
//
// There are the following formats supported:
// 1. {hex number}|{string}
//    The first part is a number in hexadecimal which is part of the original data.
//    It holds different meanings in different protocols.
// 2. (hex)|{hex value}
//    The first part is the constant "hex" and the second part is its value
// 3. (string)|{string value}
//    The first part is the constant "string" and the second part is its value
// 4. {string value}
//    If there are no the separator "|" existing, the data is considered as a string
// See the files under the "testdata" directory for how to write your data.
func getData(datas []string) ([]byte, error) {
...
}