template: add template for new components

[gcongiu]

Pull Request Description

This PR adds a more complex example of component design that focuses on component extendability. This component also showcases a simple example of qualifier support through the TEMPLATE_FUNCTION event that supports exponential and linear functions. Powers of 2 are returned at every call of PAPI_read when the exponential function is selected by the user. Incremental values from 1 onwards are returned at every call of PAPI_read when the linear function is selected.

$ utils/papi_component_avail
Available components and hardware information.
--------------------------------------------------------------------------------
PAPI version             : 7.0.1.0
Operating system         : Linux 6.1.62-1.el9.elrepo.x86_64
Vendor string and code   : AuthenticAMD (2, 0x2)
Model string and code    : AMD EPYC 7413 24-Core Processor (1, 0x1)
CPU revision             : 1.000000
CPUID                    : Family/Model/Stepping 25/1/1, 0x19/0x01/0x01
CPU Max MHz              : 3630
CPU Min MHz              : 1500
Total cores              : 96
SMT threads per core     : 2
Cores per socket         : 24
Sockets                  : 2
Cores per NUMA region    : 48
NUMA regions             : 2
Running in a VM          : no
Number Hardware Counters : 5
Max Multiplex Counters   : 384
Fast counter read (rdpmc): yes
--------------------------------------------------------------------------------

Compiled-in components:
Name:   perf_event              Linux perf_event CPU counters
Name:   perf_event_uncore       Linux perf_event CPU uncore and northbridge
Name:   template                Template component for new components
Name:   sysdetect               System info detection component

Active components:
Name:   perf_event              Linux perf_event CPU counters
                                Native: 145, Preset: 27, Counters: 5
                                PMUs supported: perf, perf_raw, amd64_fam19h_zen3

Name:   perf_event_uncore       Linux perf_event CPU uncore and northbridge
                                Native: 4, Preset: 0, Counters: 7
                                PMUs supported: amd64_rapl, amd64_fam19h_zen3_l3

Name:   template                Template component for new components
                                Native: 3, Preset: 0, Counters: 3

Name:   sysdetect               System info detection component
                                Native: 0, Preset: 0, Counters: 0


--------------------------------------------------------------------------------


$ utils/papi_native_avail
...
 Native Events in Component: template
===============================================================================
| templ:::TEMPLATE_ZERO                                                        |
|            This is a template counter, that always returns 0                 |
|     :device=0                                                                |
|            Mandatory device qualifier [0,1,2,3,4,5,6,7]                      |
--------------------------------------------------------------------------------
| templ:::TEMPLATE_CONSTANT                                                    |
|            This is a template counter, that always returns a constant value o|
|            f 42                                                              |
|     :device=0                                                                |
|            Mandatory device qualifier [0,1,2,3,4,5,6,7]                      |
--------------------------------------------------------------------------------
| templ:::TEMPLATE_FUNCTION                                                    |
|            This is a template counter, that allows for different functions   |
|     :device=0                                                                |
|            Mandatory device qualifier [0,1,2,3,4,5,6,7]                      |
|     :function=exp                                                            |
|            Mandatory function qualifier (exp,sum)                            |
===============================================================================
 Native Events in Component: sysdetect
===============================================================================

Total events reported: 152

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