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Add support for Thrift IDL parsing and printing (#17)

This PR adds support for `.thrift` IDL file parsing and printing. Code is not optimized for performance and could use some cleaning up.

This PR closes #11.

Example output:

```sh
FROM_SOURCE=1 bin/thrift-tool --port 9090 --pcap-file thrift_tools/tests/resources/calc-service-binary.pcap dump --show-all --pretty --idl-file=thrift_tools/tests/resources/tutorial.thrift
reading from file thrift_tools/tests/resources/calc-service-binary.pcap, link-type EN10MB (Ethernet)
[00:55:50:387214] 127.0.0.1:51112 -> 127.0.0.1:9090: method=ping, type=call, seqid=0
header: None
fields: []
------>[00:55:50:387370] 127.0.0.1:9090 -> 127.0.0.1:51112: method=ping, type=reply, seqid=0
        header: None
        fields: fields=[]
[00:55:50:387492] 127.0.0.1:51112 -> 127.0.0.1:9090: method=add, type=call, seqid=0
header: None
fields: [('num1', 1), ('num2', 1)]
------>[00:55:50:387596] 127.0.0.1:9090 -> 127.0.0.1:51112: method=add, type=reply, seqid=0
        header: None
        fields: 2
[00:55:50:387696] 127.0.0.1:51112 -> 127.0.0.1:9090: method=calculate, type=call, seqid=0
header: None
fields: [   ('logid', 1),
    (   'w',
        (   'Work',
            [('num1', 1), ('num2', 0), ('op', 'DIVIDE'), ('comment', None)]))]
------>[00:55:50:387840] 127.0.0.1:9090 -> 127.0.0.1:51112: method=calculate, type=reply, seqid=0
        header: None
        fields: ('InvalidOperation', [('whatOp', 4), ('why', 'Cannot divide by 0')])
[00:55:50:388615] 127.0.0.1:51112 -> 127.0.0.1:9090: method=calculate, type=call, seqid=0
header: None
fields: [   ('logid', 1),
    (   'w',
        (   'Work',
            [   ('num1', 15),
                ('num2', 10),
                ('op', 'SUBTRACT'),
                ('comment', None)]))]
------>[00:55:50:388725] 127.0.0.1:9090 -> 127.0.0.1:51112: method=calculate, type=reply, seqid=0
        header: None
        fields: 5
[00:55:50:388811] 127.0.0.1... (continued)

255 of 255 new or added lines in 9 files covered. (100.0%)

1212 of 1463 relevant lines covered (82.84%)

3.31 hits per line