Idea: Add alternate request id factory that uses request counter

[messa]

The default request id factory returns a random string:

2020-01-15 15:58:47,238  INFO: [req:O5bvIlU] Processing GET / (__main__:hello)
2020-01-15 15:58:47,950  INFO: [req:xtMacpA] Processing GET / (__main__:hello)

Sometimes I feel like adding request counter would be better:

2020-01-15 15:58:47,238  INFO: [req:xtMac0001] Processing GET / (__main__:hello)
2020-01-15 15:58:47,950  INFO: [req:xtMac0002] Processing GET / (__main__:hello)

I want to keep some random string in the request id so it can be better searched in logs.
Also it can help when logging from multiple processes (each having their own counter) to one log file.

Maybe let's provide an alternative request id factory for this and let users configure this one instead of the default request id factory.

[messa]

Added in version 0.0.6. Commit: 11d286d

Sample log output:

2024-06-02 11:08:06,753 [MainThread] aiohttp_request_id_logging  INFO: [req:qphq0000] Processing GET / (__main__:hello)
2024-06-02 11:08:07,755 [MainThread] __main__                    INFO: [req:qphq0000] Doing something
2024-06-02 11:08:08,755 [MainThread] aiohttp.access              INFO: [req:qphq0000] 127.0.0.1 "GET / HTTP/1.1" 200 165 "-" "curl/7.88.1" 2.002257
2024-06-02 11:08:09,827 [MainThread] aiohttp_request_id_logging  INFO: [req:qphq0001] Processing GET / (__main__:hello)
2024-06-02 11:08:10,829 [MainThread] __main__                    INFO: [req:qphq0001] Doing something
2024-06-02 11:08:11,830 [MainThread] aiohttp.access              INFO: [req:qphq0001] 127.0.0.1 "GET / HTTP/1.1" 200 165 "-" "curl/7.88.1" 2.003048