BUG: Missing quotes around multiline text in to_csv output

```
df = pd.DataFrame.from_dict({1:'Single line', 2:'Multiline \n with bkslash_N', 3:'Multiline \r with bkslash_R'}, orient="index", columns=['text'])
df.to_csv()

',0\n1,Single line\n2,"Multiline \n with bkslash_N"\n3,Multiline \r with bkslash_R\n'
```
No quotes on line 3

#### Problem description
When text has '\r' as a line separator, `pandas.to_csv()` does not consider such text as multiline and does not surround it with quotes. As a result such CSV files are incompatible other parsers.  


#### Expected Output
The text around  "Multiline \r with bkslash_R" should be quoted
```
',0\n1,Single line\n2,"Multiline \n with bkslash_N"\n3,"Multiline \r with bkslash_R"\n'
```
#### Output of ``pd.show_versions()``

<details>

INSTALLED VERSIONS
------------------
commit           : b5958ee1999e9aead1938c0bba2b674378807b3d
python           : 3.6.12.final.0
python-bits      : 64
OS               : Darwin
OS-release       : 20.3.0
Version          : Darwin Kernel Version 20.3.0: Thu Jan 21 00:07:06 PST 2021; root:xnu-7195.81.3~1/RELEASE_X86_64
machine          : x86_64
processor        : i386
byteorder        : little
LC_ALL           : en_US.UTF-8
LANG             : en_US.UTF-8
LOCALE           : en_US.UTF-8
pandas           : 1.1.5
numpy            : 1.19.5
pytz             : 2021.1
dateutil         : 2.8.1
pip              : 20.3.3
setuptools       : 52.0.0.post20210125
Cython           : None
pytest           : None
hypothesis       : None
sphinx           : None
blosc            : None
feather          : None
xlsxwriter       : None
lxml.etree       : None
html5lib         : None
pymysql          : None
psycopg2         : None
jinja2           : 2.11.3
IPython          : 7.16.1
pandas_datareader: None
bs4              : None
bottleneck       : None
fsspec           : 0.8.5
fastparquet      : None
gcsfs            : None
matplotlib       : 3.3.4
numexpr          : None
odfpy            : None
openpyxl         : None
pandas_gbq       : None
pyarrow          : 3.0.0
pytables         : None
pyxlsb           : None
s3fs             : None
scipy            : 1.5.4
sqlalchemy       : None
tables           : None
tabulate         : None
xarray           : None
xlrd             : None
xlwt             : None
numba            : None
</details>
